diff --git a/apps/emqx/src/emqx_alarm.erl b/apps/emqx/src/emqx_alarm.erl
index 209715a85..84c40ef2a 100644
--- a/apps/emqx/src/emqx_alarm.erl
+++ b/apps/emqx/src/emqx_alarm.erl
@@ -325,19 +325,20 @@ deactivate_alarm(
         false ->
             ok
     end,
+    Now = erlang:system_time(microsecond),
     HistoryAlarm = make_deactivated_alarm(
         ActivateAt,
         Name,
         Details0,
         Msg0,
-        erlang:system_time(microsecond)
+        Now
     ),
     DeActAlarm = make_deactivated_alarm(
         ActivateAt,
         Name,
         Details,
         normalize_message(Name, iolist_to_binary(Message)),
-        erlang:system_time(microsecond)
+        Now
     ),
     mria:dirty_write(?DEACTIVATED_ALARM, HistoryAlarm),
     mria:dirty_delete(?ACTIVATED_ALARM, Name),
diff --git a/apps/emqx/src/emqx_os_mon.erl b/apps/emqx/src/emqx_os_mon.erl
index a06f56a4c..c5ce35bf9 100644
--- a/apps/emqx/src/emqx_os_mon.erl
+++ b/apps/emqx/src/emqx_os_mon.erl
@@ -93,9 +93,9 @@ init([]) ->
     %% memsup is not reliable, ignore
     memsup:set_sysmem_high_watermark(1.0),
     SysHW = init_os_monitor(),
-    _ = start_mem_check_timer(),
-    _ = start_cpu_check_timer(),
-    {ok, #{sysmem_high_watermark => SysHW}}.
+    MemRef = start_mem_check_timer(),
+    CpuRef = start_cpu_check_timer(),
+    {ok, #{sysmem_high_watermark => SysHW, mem_time_ref => MemRef, cpu_time_ref => CpuRef}}.
 
 init_os_monitor() ->
     init_os_monitor(emqx:get_config([sysmon, os])).
@@ -125,13 +125,15 @@ handle_cast(Msg, State) ->
 
 handle_info({timeout, _Timer, mem_check}, #{sysmem_high_watermark := HWM} = State) ->
     ok = update_mem_alarm_status(HWM),
-    ok = start_mem_check_timer(),
-    {noreply, State};
+    Ref = start_mem_check_timer(),
+    {noreply, State#{mem_time_ref => Ref}};
 handle_info({timeout, _Timer, cpu_check}, State) ->
     CPUHighWatermark = emqx:get_config([sysmon, os, cpu_high_watermark]) * 100,
     CPULowWatermark = emqx:get_config([sysmon, os, cpu_low_watermark]) * 100,
-    case emqx_vm:cpu_util() of
-        0 ->
+    CPUVal = emqx_vm:cpu_util(),
+    case CPUVal of
+        %% 0 or 0.0
+        Busy when Busy == 0 ->
             ok;
         Busy when Busy > CPUHighWatermark ->
             _ = emqx_alarm:activate(
@@ -156,11 +158,14 @@ handle_info({timeout, _Timer, cpu_check}, State) ->
         _Busy ->
             ok
     end,
-    ok = start_cpu_check_timer(),
-    {noreply, State};
-handle_info({monitor_conf_update, OS}, _State) ->
+    Ref = start_cpu_check_timer(),
+    {noreply, State#{cpu_time_ref => Ref}};
+handle_info({monitor_conf_update, OS}, State) ->
+    cancel_outdated_timer(State),
     SysHW = init_os_monitor(OS),
-    {noreply, #{sysmem_high_watermark => SysHW}};
+    MemRef = start_mem_check_timer(),
+    CpuRef = start_cpu_check_timer(),
+    {noreply, #{sysmem_high_watermark => SysHW, mem_time_ref => MemRef, cpu_time_ref => CpuRef}};
 handle_info(Info, State) ->
     ?SLOG(error, #{msg => "unexpected_info", info => Info}),
     {noreply, State}.
@@ -174,11 +179,15 @@ code_change(_OldVsn, State, _Extra) ->
 %%--------------------------------------------------------------------
 %% Internal functions
 %%--------------------------------------------------------------------
+cancel_outdated_timer(#{mem_time_ref := MemRef, cpu_time_ref := CpuRef}) ->
+    emqx_misc:cancel_timer(MemRef),
+    emqx_misc:cancel_timer(CpuRef),
+    ok.
 
 start_cpu_check_timer() ->
     Interval = emqx:get_config([sysmon, os, cpu_check_interval]),
     case erlang:system_info(system_architecture) of
-        "x86_64-pc-linux-musl" -> ok;
+        "x86_64-pc-linux-musl" -> undefined;
         _ -> start_timer(Interval, cpu_check)
     end.
 
@@ -191,12 +200,11 @@ start_mem_check_timer() ->
         true ->
             start_timer(Interval, mem_check);
         false ->
-            ok
+            undefined
     end.
 
 start_timer(Interval, Msg) ->
-    _ = emqx_misc:start_timer(Interval, Msg),
-    ok.
+    emqx_misc:start_timer(Interval, Msg).
 
 update_mem_alarm_status(HWM) when HWM > 1.0 orelse HWM < 0.0 ->
     ?SLOG(warning, #{msg => "discarded_out_of_range_mem_alarm_threshold", value => HWM}),
@@ -223,7 +231,7 @@ do_update_mem_alarm_status(HWM0) ->
                 },
                 usage_msg(Usage, mem)
             );
-        _ ->
+        false ->
             ok = emqx_alarm:ensure_deactivated(
                 high_system_memory_usage,
                 #{
@@ -236,5 +244,5 @@ do_update_mem_alarm_status(HWM0) ->
     ok.
 
 usage_msg(Usage, What) ->
-    %% devide by 1.0 to ensure float point number
+    %% divide by 1.0 to ensure float point number
     iolist_to_binary(io_lib:format("~.2f% ~p usage", [Usage / 1.0, What])).
diff --git a/apps/emqx/src/emqx_vm.erl b/apps/emqx/src/emqx_vm.erl
index cf1a9dc08..f80d18a3a 100644
--- a/apps/emqx/src/emqx_vm.erl
+++ b/apps/emqx/src/emqx_vm.erl
@@ -175,9 +175,9 @@ schedulers() ->
 
 loads() ->
     [
-        {load1, ftos(avg1() / 256)},
-        {load5, ftos(avg5() / 256)},
-        {load15, ftos(avg15() / 256)}
+        {load1, load(avg1())},
+        {load5, load(avg5())},
+        {load15, load(avg15())}
     ].
 
 system_info_keys() -> ?SYSTEM_INFO_KEYS.
@@ -232,9 +232,6 @@ mem_info() ->
     Free = proplists:get_value(free_memory, Dataset),
     [{total_memory, Total}, {used_memory, Total - Free}].
 
-ftos(F) ->
-    io_lib:format("~.2f", [F / 1.0]).
-
 %%%% erlang vm scheduler_usage  fun copied from recon
 scheduler_usage(Interval) when is_integer(Interval) ->
     %% We start and stop the scheduler_wall_time system flag
@@ -391,18 +388,32 @@ cpu_util() ->
 compat_windows(Fun) ->
     case os:type() of
         {win32, nt} ->
-            0;
+            0.0;
         _Type ->
             case catch Fun() of
+                Val when is_float(Val) -> floor(Val * 100) / 100;
                 Val when is_number(Val) -> Val;
-                _Error -> 0
+                _Error -> 0.0
             end
     end.
 
-%% @doc Return on which Eralng/OTP the current vm is running.
-%% NOTE: This API reads a file, do not use it in critical code paths.
+load(Avg) ->
+    floor((Avg / 256) * 100) / 100.
+
+%% @doc Return on which Erlang/OTP the current vm is running.
+%% The dashboard's /api/nodes endpoint will call this function frequently.
+%% we should avoid reading file every time.
+%% The OTP version never changes at runtime expect upgrade erts,
+%% so we cache it in a persistent term for performance.
 get_otp_version() ->
-    read_otp_version().
+    case persistent_term:get(emqx_otp_version, undefined) of
+        undefined ->
+            OtpVsn = read_otp_version(),
+            persistent_term:put(emqx_otp_version, OtpVsn),
+            OtpVsn;
+        OtpVsn when is_binary(OtpVsn) ->
+            OtpVsn
+    end.
 
 read_otp_version() ->
     ReleasesDir = filename:join([code:root_dir(), "releases"]),
@@ -416,6 +427,8 @@ read_otp_version() ->
             %% running tests etc.
             OtpMajor = erlang:system_info(otp_release),
             OtpVsnFile = filename:join([ReleasesDir, OtpMajor, "OTP_VERSION"]),
-            {ok, Vsn} = file:read_file(OtpVsnFile),
-            Vsn
+            case file:read_file(OtpVsnFile) of
+                {ok, Vsn} -> Vsn;
+                {error, enoent} -> list_to_binary(OtpMajor)
+            end
     end.
diff --git a/apps/emqx/src/emqx_vm_mon.erl b/apps/emqx/src/emqx_vm_mon.erl
index 5447e94e9..1327a1bb0 100644
--- a/apps/emqx/src/emqx_vm_mon.erl
+++ b/apps/emqx/src/emqx_vm_mon.erl
@@ -63,7 +63,7 @@ handle_info({timeout, _Timer, check}, State) ->
     ProcessCount = erlang:system_info(process_count),
     case ProcessCount / erlang:system_info(process_limit) of
         Percent when Percent > ProcHighWatermark ->
-            Usage = io_lib:format("~p%", [Percent * 100]),
+            Usage = usage(Percent),
             Message = [Usage, " process usage"],
             emqx_alarm:activate(
                 too_many_processes,
@@ -75,7 +75,7 @@ handle_info({timeout, _Timer, check}, State) ->
                 Message
             );
         Percent when Percent < ProcLowWatermark ->
-            Usage = io_lib:format("~p%", [Percent * 100]),
+            Usage = usage(Percent),
             Message = [Usage, " process usage"],
             emqx_alarm:ensure_deactivated(
                 too_many_processes,
@@ -108,3 +108,6 @@ code_change(_OldVsn, State, _Extra) ->
 start_check_timer() ->
     Interval = emqx:get_config([sysmon, vm, process_check_interval]),
     emqx_misc:start_timer(Interval, check).
+
+usage(Percent) ->
+    integer_to_list(floor(Percent * 100)) ++ "%".
diff --git a/apps/emqx/test/emqx_os_mon_SUITE.erl b/apps/emqx/test/emqx_os_mon_SUITE.erl
index 8729bbdb6..0538d949a 100644
--- a/apps/emqx/test/emqx_os_mon_SUITE.erl
+++ b/apps/emqx/test/emqx_os_mon_SUITE.erl
@@ -25,25 +25,43 @@ all() -> emqx_common_test_helpers:all(?MODULE).
 
 init_per_suite(Config) ->
     emqx_common_test_helpers:boot_modules(all),
-    emqx_common_test_helpers:start_apps(
-        [],
-        fun
-            (emqx) ->
-                application:set_env(emqx, os_mon, [
-                    {cpu_check_interval, 1},
-                    {cpu_high_watermark, 5},
-                    {cpu_low_watermark, 80},
-                    {procmem_high_watermark, 5}
-                ]);
-            (_) ->
-                ok
-        end
-    ),
+    emqx_common_test_helpers:start_apps([]),
     Config.
 
 end_per_suite(_Config) ->
     emqx_common_test_helpers:stop_apps([]).
 
+init_per_testcase(t_cpu_check_alarm, Config) ->
+    SysMon = emqx_config:get([sysmon, os], #{}),
+    emqx_config:put([sysmon, os], SysMon#{
+        cpu_high_watermark => 0.9,
+        cpu_low_watermark => 0,
+        %% 200ms
+        cpu_check_interval => 200
+    }),
+    ok = supervisor:terminate_child(emqx_sys_sup, emqx_os_mon),
+    {ok, _} = supervisor:restart_child(emqx_sys_sup, emqx_os_mon),
+    Config;
+init_per_testcase(t_sys_mem_check_alarm, Config) ->
+    case os:type() of
+        {unix, linux} ->
+            SysMon = emqx_config:get([sysmon, os], #{}),
+            emqx_config:put([sysmon, os], SysMon#{
+                sysmem_high_watermark => 0.51,
+                %% 200ms
+                mem_check_interval => 200
+            }),
+            ok = supervisor:terminate_child(emqx_sys_sup, emqx_os_mon),
+            {ok, _} = supervisor:restart_child(emqx_sys_sup, emqx_os_mon),
+            Config;
+        _ ->
+            Config
+    end;
+init_per_testcase(_, Config) ->
+    emqx_common_test_helpers:boot_modules(all),
+    emqx_common_test_helpers:start_apps([]),
+    Config.
+
 t_api(_) ->
     ?assertEqual(60000, emqx_os_mon:get_mem_check_interval()),
     ?assertEqual(ok, emqx_os_mon:set_mem_check_interval(30000)),
@@ -67,3 +85,106 @@ t_api(_) ->
     emqx_os_mon ! ignored,
     gen_server:stop(emqx_os_mon),
     ok.
+
+t_sys_mem_check_alarm(Config) ->
+    case os:type() of
+        {unix, linux} ->
+            do_sys_mem_check_alarm(Config);
+        _ ->
+            skip
+    end.
+
+do_sys_mem_check_alarm(_Config) ->
+    emqx_config:put([sysmon, os, mem_check_interval], 200),
+    emqx_os_mon:update(emqx_config:get([sysmon, os])),
+    Mem = 0.52345,
+    Usage = floor(Mem * 10000) / 100,
+    emqx_common_test_helpers:with_mock(
+        load_ctl,
+        get_memory_usage,
+        fun() -> Mem end,
+        fun() ->
+            timer:sleep(500),
+            Alarms = emqx_alarm:get_alarms(activated),
+            ?assert(
+                emqx_vm_mon_SUITE:is_existing(
+                    high_system_memory_usage, emqx_alarm:get_alarms(activated)
+                ),
+                #{
+                    load_ctl_memory => load_ctl:get_memory_usage(),
+                    config => emqx_config:get([sysmon, os]),
+                    process => sys:get_state(emqx_os_mon),
+                    alarms => Alarms
+                }
+            ),
+            [
+                #{
+                    activate_at := _,
+                    activated := true,
+                    deactivate_at := infinity,
+                    details := #{high_watermark := 51.0, usage := RealUsage},
+                    message := Msg,
+                    name := high_system_memory_usage
+                }
+            ] =
+                lists:filter(
+                    fun
+                        (#{name := high_system_memory_usage}) -> true;
+                        (_) -> false
+                    end,
+                    Alarms
+                ),
+            ?assert(RealUsage >= Usage, {RealUsage, Usage}),
+            ?assert(is_binary(Msg)),
+            emqx_config:put([sysmon, os, sysmem_high_watermark], 0.99999),
+            ok = supervisor:terminate_child(emqx_sys_sup, emqx_os_mon),
+            {ok, _} = supervisor:restart_child(emqx_sys_sup, emqx_os_mon),
+            timer:sleep(600),
+            Activated = emqx_alarm:get_alarms(activated),
+            ?assertNot(
+                emqx_vm_mon_SUITE:is_existing(high_system_memory_usage, Activated),
+                #{activated => Activated, process_state => sys:get_state(emqx_os_mon)}
+            )
+        end
+    ).
+
+t_cpu_check_alarm(_) ->
+    CpuUtil = 90.12345,
+    Usage = floor(CpuUtil * 100) / 100,
+    emqx_common_test_helpers:with_mock(
+        cpu_sup,
+        util,
+        fun() -> CpuUtil end,
+        fun() ->
+            timer:sleep(500),
+            Alarms = emqx_alarm:get_alarms(activated),
+            ?assert(
+                emqx_vm_mon_SUITE:is_existing(high_cpu_usage, emqx_alarm:get_alarms(activated))
+            ),
+            [
+                #{
+                    activate_at := _,
+                    activated := true,
+                    deactivate_at := infinity,
+                    details := #{high_watermark := 90.0, low_watermark := 0, usage := RealUsage},
+                    message := Msg,
+                    name := high_cpu_usage
+                }
+            ] =
+                lists:filter(
+                    fun
+                        (#{name := high_cpu_usage}) -> true;
+                        (_) -> false
+                    end,
+                    Alarms
+                ),
+            ?assert(RealUsage >= Usage, {RealUsage, Usage}),
+            ?assert(is_binary(Msg)),
+            emqx_config:put([sysmon, os, cpu_high_watermark], 1),
+            emqx_config:put([sysmon, os, cpu_low_watermark], 0.96),
+            timer:sleep(500),
+            ?assertNot(
+                emqx_vm_mon_SUITE:is_existing(high_cpu_usage, emqx_alarm:get_alarms(activated))
+            )
+        end
+    ).
diff --git a/apps/emqx/test/emqx_vm_SUITE.erl b/apps/emqx/test/emqx_vm_SUITE.erl
index f9809361b..35f37a41e 100644
--- a/apps/emqx/test/emqx_vm_SUITE.erl
+++ b/apps/emqx/test/emqx_vm_SUITE.erl
@@ -24,7 +24,24 @@
 all() -> emqx_common_test_helpers:all(?MODULE).
 
 t_load(_Config) ->
-    ?assertMatch([{load1, _}, {load5, _}, {load15, _}], emqx_vm:loads()).
+    lists:foreach(
+        fun({Avg, LoadKey, Int}) ->
+            emqx_common_test_helpers:with_mock(
+                cpu_sup,
+                Avg,
+                fun() -> Int end,
+                fun() ->
+                    Load = proplists:get_value(LoadKey, emqx_vm:loads()),
+                    ?assertEqual(Int / 256, Load)
+                end
+            )
+        end,
+        [{avg1, load1, 0}, {avg5, load5, 128}, {avg15, load15, 256}]
+    ),
+    ?assertMatch(
+        [{load1, _}, {load5, _}, {load15, _}],
+        emqx_vm:loads()
+    ).
 
 t_systeminfo(_Config) ->
     ?assertEqual(
diff --git a/apps/emqx/test/emqx_vm_mon_SUITE.erl b/apps/emqx/test/emqx_vm_mon_SUITE.erl
index 140a00010..ceeffafb5 100644
--- a/apps/emqx/test/emqx_vm_mon_SUITE.erl
+++ b/apps/emqx/test/emqx_vm_mon_SUITE.erl
@@ -23,13 +23,13 @@
 
 all() -> emqx_common_test_helpers:all(?MODULE).
 
-init_per_testcase(t_alarms, Config) ->
+init_per_testcase(t_too_many_processes_alarm, Config) ->
     emqx_common_test_helpers:boot_modules(all),
     emqx_common_test_helpers:start_apps([]),
     emqx_config:put([sysmon, vm], #{
         process_high_watermark => 0,
         process_low_watermark => 0,
-        %% 1s
+        %% 100ms
         process_check_interval => 100
     }),
     ok = supervisor:terminate_child(emqx_sys_sup, emqx_vm_mon),
@@ -43,9 +43,29 @@ init_per_testcase(_, Config) ->
 end_per_testcase(_, _Config) ->
     emqx_common_test_helpers:stop_apps([]).
 
-t_alarms(_) ->
+t_too_many_processes_alarm(_) ->
     timer:sleep(500),
+    Alarms = emqx_alarm:get_alarms(activated),
     ?assert(is_existing(too_many_processes, emqx_alarm:get_alarms(activated))),
+    ?assertMatch(
+        [
+            #{
+                activate_at := _,
+                activated := true,
+                deactivate_at := infinity,
+                details := #{high_watermark := 0, low_watermark := 0, usage := "0%"},
+                message := <<"0% process usage">>,
+                name := too_many_processes
+            }
+        ],
+        lists:filter(
+            fun
+                (#{name := too_many_processes}) -> true;
+                (_) -> false
+            end,
+            Alarms
+        )
+    ),
     emqx_config:put([sysmon, vm, process_high_watermark], 70),
     emqx_config:put([sysmon, vm, process_low_watermark], 60),
     timer:sleep(500),
diff --git a/apps/emqx_management/src/emqx_mgmt.erl b/apps/emqx_management/src/emqx_mgmt.erl
index 6b38e8ca0..814b39cdc 100644
--- a/apps/emqx_management/src/emqx_mgmt.erl
+++ b/apps/emqx_management/src/emqx_mgmt.erl
@@ -126,7 +126,7 @@ lookup_node(Node) ->
 
 node_info() ->
     {UsedRatio, Total} = get_sys_memory(),
-    Info = maps:from_list([{K, list_to_binary(V)} || {K, V} <- emqx_vm:loads()]),
+    Info = maps:from_list(emqx_vm:loads()),
     BrokerInfo = emqx_sys:info(),
     Info#{
         node => node(),
@@ -150,7 +150,7 @@ node_info() ->
 get_sys_memory() ->
     case os:type() of
         {unix, linux} ->
-            load_ctl:get_sys_memory();
+            emqx_mgmt_cache:get_sys_memory();
         _ ->
             {0, 0}
     end.
diff --git a/apps/emqx_management/src/emqx_mgmt_api_nodes.erl b/apps/emqx_management/src/emqx_mgmt_api_nodes.erl
index 64ef3c1ef..cb8d37609 100644
--- a/apps/emqx_management/src/emqx_mgmt_api_nodes.erl
+++ b/apps/emqx_management/src/emqx_mgmt_api_nodes.erl
@@ -159,18 +159,18 @@ fields(node_info) ->
             )},
         {load1,
             mk(
-                string(),
-                #{desc => <<"CPU average load in 1 minute">>, example => "2.66"}
+                float(),
+                #{desc => <<"CPU average load in 1 minute">>, example => 2.66}
             )},
         {load5,
             mk(
-                string(),
-                #{desc => <<"CPU average load in 5 minute">>, example => "2.66"}
+                float(),
+                #{desc => <<"CPU average load in 5 minute">>, example => 2.66}
             )},
         {load15,
             mk(
-                string(),
-                #{desc => <<"CPU average load in 15 minute">>, example => "2.66"}
+                float(),
+                #{desc => <<"CPU average load in 15 minute">>, example => 2.66}
             )},
         {max_fds,
             mk(
diff --git a/apps/emqx_management/src/emqx_mgmt_cache.erl b/apps/emqx_management/src/emqx_mgmt_cache.erl
new file mode 100644
index 000000000..9b3cd4f56
--- /dev/null
+++ b/apps/emqx_management/src/emqx_mgmt_cache.erl
@@ -0,0 +1,108 @@
+%%--------------------------------------------------------------------
+%% Copyright (c) 2020-2023 EMQ Technologies Co., Ltd. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%--------------------------------------------------------------------
+-module(emqx_mgmt_cache).
+
+-behaviour(gen_server).
+
+-define(SYS_MEMORY_KEY, sys_memory).
+-define(EXPIRED_MS, 3000).
+%% -100ms to early update cache
+-define(REFRESH_MS, ?EXPIRED_MS - 100).
+-define(DEFAULT_BAD_MEMORY, {0, 0}).
+
+-export([start_link/0, get_sys_memory/0]).
+-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).
+
+get_sys_memory() ->
+    case get_memory_from_cache() of
+        {ok, CacheMem} ->
+            erlang:send(?MODULE, refresh_sys_memory),
+            CacheMem;
+        stale ->
+            get_sys_memory_sync()
+    end.
+
+get_sys_memory_sync() ->
+    try
+        gen_server:call(?MODULE, get_sys_memory, ?EXPIRED_MS)
+    catch
+        exit:{timeout, _} ->
+            ?DEFAULT_BAD_MEMORY
+    end.
+
+start_link() ->
+    gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
+
+init([]) ->
+    ets:new(?MODULE, [set, named_table, public, {keypos, 1}]),
+    {ok, #{latest_refresh => 0}}.
+
+handle_call(get_sys_memory, _From, State) ->
+    {Mem, NewState} = refresh_sys_memory(State),
+    {reply, Mem, NewState};
+handle_call(_Request, _From, State) ->
+    {reply, ok, State}.
+
+handle_cast(_Request, State) ->
+    {noreply, State}.
+
+handle_info(refresh_sys_memory, State) ->
+    {_, NewState} = refresh_sys_memory(State),
+    {noreply, NewState};
+handle_info(_Info, State) ->
+    {noreply, State}.
+
+terminate(_Reason, _State) ->
+    ok.
+
+code_change(_OldVsn, State, _Extra) ->
+    {ok, State}.
+
+%%%===================================================================
+%%% Internal functions
+%%%===================================================================
+
+refresh_sys_memory(State = #{latest_refresh := LatestRefresh}) ->
+    Now = now_millisecond(),
+    case Now - LatestRefresh >= ?REFRESH_MS of
+        true ->
+            do_refresh_sys_memory(Now, State);
+        false ->
+            case get_memory_from_cache() of
+                stale -> do_refresh_sys_memory(Now, State);
+                {ok, Mem} -> {Mem, State}
+            end
+    end.
+
+do_refresh_sys_memory(RefreshAt, State) ->
+    NewMem = load_ctl:get_sys_memory(),
+    NewExpiredAt = now_millisecond() + ?EXPIRED_MS,
+    ets:insert(?MODULE, {?SYS_MEMORY_KEY, {NewMem, NewExpiredAt}}),
+    {NewMem, State#{latest_refresh => RefreshAt}}.
+
+get_memory_from_cache() ->
+    case ets:lookup(?MODULE, ?SYS_MEMORY_KEY) of
+        [] ->
+            stale;
+        [{_, {Mem, ExpiredAt}}] ->
+            case now_millisecond() < ExpiredAt of
+                true -> {ok, Mem};
+                false -> stale
+            end
+    end.
+
+now_millisecond() ->
+    erlang:system_time(millisecond).
diff --git a/apps/emqx_management/src/emqx_mgmt_cli.erl b/apps/emqx_management/src/emqx_mgmt_cli.erl
index 0e7506a0b..442d5c7de 100644
--- a/apps/emqx_management/src/emqx_mgmt_cli.erl
+++ b/apps/emqx_management/src/emqx_mgmt_cli.erl
@@ -315,7 +315,7 @@ vm([]) ->
 vm(["all"]) ->
     [vm([Name]) || Name <- ["load", "memory", "process", "io", "ports"]];
 vm(["load"]) ->
-    [emqx_ctl:print("cpu/~-20s: ~ts~n", [L, V]) || {L, V} <- emqx_vm:loads()];
+    [emqx_ctl:print("cpu/~-20s: ~w~n", [L, V]) || {L, V} <- emqx_vm:loads()];
 vm(["memory"]) ->
     [emqx_ctl:print("memory/~-17s: ~w~n", [Cat, Val]) || {Cat, Val} <- erlang:memory()];
 vm(["process"]) ->
diff --git a/apps/emqx_management/src/emqx_mgmt_sup.erl b/apps/emqx_management/src/emqx_mgmt_sup.erl
index 329532fa1..713ff87dc 100644
--- a/apps/emqx_management/src/emqx_mgmt_sup.erl
+++ b/apps/emqx_management/src/emqx_mgmt_sup.erl
@@ -26,4 +26,21 @@ start_link() ->
     supervisor:start_link({local, ?MODULE}, ?MODULE, []).
 
 init([]) ->
-    {ok, {{one_for_one, 1, 5}, []}}.
+    Workers =
+        case os:type() of
+            {unix, linux} ->
+                [child_spec(emqx_mgmt_cache, 5000, worker)];
+            _ ->
+                []
+        end,
+    {ok, {{one_for_one, 1, 5}, Workers}}.
+
+child_spec(Mod, Shutdown, Type) ->
+    #{
+        id => Mod,
+        start => {Mod, start_link, []},
+        restart => permanent,
+        shutdown => Shutdown,
+        type => Type,
+        modules => [Mod]
+    }.
diff --git a/apps/emqx_management/test/emqx_mgmt_api_alarms_SUITE.erl b/apps/emqx_management/test/emqx_mgmt_api_alarms_SUITE.erl
index adff41214..2c61651bf 100644
--- a/apps/emqx_management/test/emqx_mgmt_api_alarms_SUITE.erl
+++ b/apps/emqx_management/test/emqx_mgmt_api_alarms_SUITE.erl
@@ -40,6 +40,9 @@ t_alarms_api(_) ->
     get_alarms(1, true),
     get_alarms(1, false).
 
+t_alarm_cpu(_) ->
+    ok.
+
 t_delete_alarms_api(_) ->
     Path = emqx_mgmt_api_test_util:api_path(["alarms"]),
     {ok, _} = emqx_mgmt_api_test_util:request_api(delete, Path),
diff --git a/apps/emqx_management/test/emqx_mgmt_api_nodes_SUITE.erl b/apps/emqx_management/test/emqx_mgmt_api_nodes_SUITE.erl
index 2bbdf938d..03b0ea2d9 100644
--- a/apps/emqx_management/test/emqx_mgmt_api_nodes_SUITE.erl
+++ b/apps/emqx_management/test/emqx_mgmt_api_nodes_SUITE.erl
@@ -24,11 +24,11 @@ all() ->
     emqx_common_test_helpers:all(?MODULE).
 
 init_per_suite(Config) ->
-    emqx_mgmt_api_test_util:init_suite([emqx_conf]),
+    emqx_mgmt_api_test_util:init_suite([emqx_conf, emqx_management]),
     Config.
 
 end_per_suite(_) ->
-    emqx_mgmt_api_test_util:end_suite([emqx_conf]).
+    emqx_mgmt_api_test_util:end_suite([emqx_management, emqx_conf]).
 
 init_per_testcase(t_log_path, Config) ->
     emqx_config_logger:add_handler(),
@@ -152,7 +152,7 @@ cluster(Specs) ->
     Env = [{emqx, boot_modules, []}],
     emqx_common_test_helpers:emqx_cluster(Specs, [
         {env, Env},
-        {apps, [emqx_conf]},
+        {apps, [emqx_conf, emqx_management]},
         {load_schema, false},
         {join_to, true},
         {env_handler, fun