diff --git a/src/apis/createElement.ts b/src/apis/createElement.ts
index 07ae3254..6e05d9db 100644
--- a/src/apis/createElement.ts
+++ b/src/apis/createElement.ts
@@ -7,17 +7,19 @@ type CreateElement = Vue['$createElement']
 
 let fallbackCreateElement: CreateElement
 
-export const createElement = (function createElement(...args: any) {
+export const createElement = function createElement(...args: any) {
   const instance = getCurrentInstance()?.proxy
   if (!instance) {
-    warn('`createElement()` has been called outside of render function.')
+    __DEV__ &&
+      warn('`createElement()` has been called outside of render function.')
     if (!fallbackCreateElement) {
-      fallbackCreateElement = defineComponentInstance(getVueConstructor())
-        .$createElement
+      fallbackCreateElement = defineComponentInstance(
+        getVueConstructor()
+      ).$createElement
     }
 
     return fallbackCreateElement.apply(fallbackCreateElement, args)
   }
 
   return instance.$createElement.apply(instance, args)
-} as any) as CreateElement
+} as any as CreateElement
diff --git a/src/apis/inject.ts b/src/apis/inject.ts
index 8247a91c..44183798 100644
--- a/src/apis/inject.ts
+++ b/src/apis/inject.ts
@@ -54,7 +54,8 @@ export function inject(
 
   const vm = getCurrentInstance()?.proxy
   if (!vm) {
-    warn(`inject() can only be used inside setup() or functional components.`)
+    __DEV__ &&
+      warn(`inject() can only be used inside setup() or functional components.`)
     return
   }
 
diff --git a/src/mixin.ts b/src/mixin.ts
index 8ea9292e..078c846c 100644
--- a/src/mixin.ts
+++ b/src/mixin.ts
@@ -210,10 +210,11 @@ export function mixin(Vue: VueConstructor) {
       proxy(ctx, key, {
         get: () => vm[srcKey],
         set() {
-          warn(
-            `Cannot assign to '${key}' because it is a read-only property`,
-            vm
-          )
+          __DEV__ &&
+            warn(
+              `Cannot assign to '${key}' because it is a read-only property`,
+              vm
+            )
         },
       })
     })
@@ -237,10 +238,11 @@ export function mixin(Vue: VueConstructor) {
           return data
         },
         set() {
-          warn(
-            `Cannot assign to '${key}' because it is a read-only property`,
-            vm
-          )
+          __DEV__ &&
+            warn(
+              `Cannot assign to '${key}' because it is a read-only property`,
+              vm
+            )
         },
       })
     })
diff --git a/src/utils/helper.ts b/src/utils/helper.ts
index b72ce792..753bc907 100644
--- a/src/utils/helper.ts
+++ b/src/utils/helper.ts
@@ -34,10 +34,12 @@ export function isComponentInstance(obj: any) {
 export function createSlotProxy(vm: ComponentInstance, slotName: string) {
   return (...args: any) => {
     if (!vm.$scopedSlots[slotName]) {
-      return warn(
-        `slots.${slotName}() got called outside of the "render()" scope`,
-        vm
-      )
+      if (__DEV__)
+        return warn(
+          `slots.${slotName}() got called outside of the "render()" scope`,
+          vm
+        )
+      return
     }
 
     return vm.$scopedSlots[slotName]!.apply(vm, args)