diff --git a/.gitignore b/.gitignore
index 138d33e..5d5b644 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,5 @@ libquicer_nif.so
 rebar3
 *.crashdump
 _checkouts/
+.envrc
+erlang_ls.config
diff --git a/src/emqtt_bench.erl b/src/emqtt_bench.erl
index 5575d53..9b47614 100644
--- a/src/emqtt_bench.erl
+++ b/src/emqtt_bench.erl
@@ -27,6 +27,9 @@
         , loop/5
         ]).
 
+%% Internal callback
+-export([wakeup_main_loop/2, main_loop/2]).
+
 -define(STARTNUMBER_DESC,
         "The start point when assigning sequence numbers to clients. "
         "This is useful when running multiple emqtt-bench "
@@ -502,12 +505,20 @@ main_loop(Uptime, Count) ->
             maybe_print_qoe(Count),
             maybe_dump_nst_dets(Count),
             garbage_collect(),
-            main_loop(Uptime, Count);
+            hibernate_main_loop(Uptime, Count);
         Msg ->
             print("main_loop_msg: ~p~n", [Msg]),
-            main_loop(Uptime, Count)
+            hibernate_main_loop(Uptime, Count)
+    after 5 ->
+        hibernate_main_loop(Uptime, Count)
     end.
 
+hibernate_main_loop(Uptime, Count) ->
+    proc_lib:hibernate(?MODULE, wakeup_main_loop, [Uptime, Count]).
+
+wakeup_main_loop(Uptime, Count) ->
+    ?MODULE:main_loop(Uptime, Count).
+
 maybe_dump_nst_dets(Count)->
     Count == ets:info(quic_clients_nsts, size)
       andalso undefined =/= dets:info(dets_quic_nsts)
@@ -743,7 +754,6 @@ maybe_retry(Parent, N, PubSub, Opts, ContinueFn) ->
 loop(Parent, N, Client, PubSub, Opts) ->
     Interval = proplists:get_value(interval_of_msg, Opts, 0),
     Prometheus = lists:member(prometheus, Opts),
-    Idle = max(Interval * 2, 500),
     MRef = proplists:get_value(publish_signal_mref, Opts),
     receive
         {'DOWN', MRef, process, _Pid, start_publishing} ->
@@ -818,7 +828,7 @@ loop(Parent, N, Client, PubSub, Opts) ->
             io:format("client(~w): discarded unknown message ~p~n", [N, Other]),
             loop(Parent, N, Client, PubSub, Opts)
     after
-        Idle ->
+        _Idle = max(Interval * 2, 50) ->
             case proplists:get_bool(lowmem, Opts) of
                 true ->
                     erlang:garbage_collect(Client, [{type, major}]),