Enha: client stop string for completion only

.golangci.yml

@@ -1,6 +1,7 @@
 version: "2"
 run:
-  concurrency: 2
+  timeout: 1m
+  concurrency: 4
   tests: false
 linters:
   default: none
@@ -14,7 +15,13 @@ linters:
     - prealloc
     - staticcheck
     - unused
+    - gocritic
+    - unconvert
+    - wastedassign
   settings:
+    gocritic:
+      enabled-tags:
+        - performance
     funlen:
       lines: 80
       statements: 50