diff --git a/apps/els_lsp/src/els_diagnostics.erl b/apps/els_lsp/src/els_diagnostics.erl
index eb4d32f11..58bd3043f 100644
--- a/apps/els_lsp/src/els_diagnostics.erl
+++ b/apps/els_lsp/src/els_diagnostics.erl
@@ -39,7 +39,8 @@
 -callback run(uri())                         -> [diagnostic()].
 -callback source()                           -> binary().
 -callback on_complete(uri(), [diagnostic()]) -> ok.
--optional_callbacks([ on_complete/2 ]).
+-callback init()                             -> ok.
+-optional_callbacks([ on_complete/2, init/0 ]).
 
 %%==============================================================================
 %% API
@@ -79,9 +80,7 @@ enabled_diagnostics() ->
   Default = default_diagnostics(),
   Enabled = maps:get("enabled", Config, []),
   Disabled = maps:get("disabled", Config, []),
-  Diagnostics = lists:usort((Default ++ valid(Enabled)) -- valid(Disabled)),
-  ok = extra(Diagnostics),
-  Diagnostics.
+  lists:usort((Default ++ valid(Enabled)) -- valid(Disabled)).
 
 -spec make_diagnostic(range(), binary(), severity(), binary()) -> diagnostic().
 make_diagnostic(Range, Message, Severity, Source) ->
@@ -119,6 +118,7 @@ run_diagnostic(Uri, Id) ->
                     els_diagnostics_provider:notify(Diagnostics, self())
                 end
             },
+  ok = init_diagnostic(CbModule),
   {ok, Pid} = els_background_job:new(Config),
   Pid.
 
@@ -150,11 +150,11 @@ valid(Ids0) ->
   end,
   Valid.
 
--spec extra(list()) -> ok.
-extra([]) ->
-  ok;
-extra([<<"sheldon">>|_]) ->
-  {ok, _} = application:ensure_all_started(sheldon),
-  ok;
-extra([_|T]) ->
-  extra(T).
+-spec init_diagnostic(atom()) -> ok.
+init_diagnostic(CbModule) ->
+  case erlang:function_exported(CbModule, init, 0) of
+    true ->
+      CbModule:init();
+    false ->
+      ok
+  end.
diff --git a/apps/els_lsp/src/els_sheldon_diagnostics.erl b/apps/els_lsp/src/els_sheldon_diagnostics.erl
index af8422796..84230fa2b 100644
--- a/apps/els_lsp/src/els_sheldon_diagnostics.erl
+++ b/apps/els_lsp/src/els_sheldon_diagnostics.erl
@@ -1,5 +1,5 @@
 %%==============================================================================
-%% Compiler diagnostics
+%% Sheldon diagnostics
 %%==============================================================================
 
 -module(els_sheldon_diagnostics).
@@ -14,7 +14,8 @@
 %% Exports
 %%==============================================================================
 
--export([ is_default/0
+-export([ init/0
+        , is_default/0
         , run/1
         , source/0
         ]).
@@ -30,6 +31,14 @@
 %% Callback Functions
 %%==============================================================================
 
+-spec init() -> ok.
+init() ->
+  %% By default "sheldon" is not started by reason that he spend few seconds
+  %% to prepare and load dictionary. The "sheldon" shoulld be load only once
+  %% when diagnostic is enabled.
+  application:ensure_all_started(sheldon),
+  ok.
+
 -spec is_default() -> boolean().
 is_default() ->
   false.
@@ -45,8 +54,10 @@ run(Uri) ->
       of
         [] -> [];
         Problems -> format_diagnostics(Problems)
-      catch _:Err ->
-        ?LOG_WARNING("Sheldon error.[Err=~p] ", [Err]),
+      catch Type:Error:Stacktrace ->
+        ?LOG_WARNING( "Sheldon error: [type=~p] [error=~p] [stacktrace=~p]"
+                    , [Type, Error, Stacktrace]
+                    ),
         []
       end
     end.