vue3使用ref的性能警告问题

<template>
  <div>
    <component :is="currentTabComponent"></component>
  </div>
</template>

<script setup>

import { ref,shallowRef } from "vue";
import TodoList from "./components/TodoList.vue";
import Rate from "./components/Rate.vue";

let tabs ={
  TodoList,
  Rate
}
let currentTabComponent = ref(TodoList)
</script>

<template>
  <div>
    <h1>带动画的Todolist</h1>
    <button
      v-for="(i,tab) in tabs"
      :key="i"
      :class="['tab-button', { active: currentTabComponent === tab }]"
      @click="fn(tab)"
    >
      {{ tab }}
    </button>
    <component :is="currentTabComponent"></component>
  </div>
</template>

<script setup>

import { ref,shallowRef } from "vue";
import TodoList from "./components/TodoList.vue";
import Rate from "./components/Rate.vue";

let tabs ={
  TodoList,
  Rate
}
let currentTabComponent = shallowRef(TodoList)

function fn (tab){
  currentTabComponent.value = tabs[tab]
}
</script>

<template>
    <div>
        <h1>{{mycount}}</h1>
        <button @click="changeMyCount">changeMyCount</button>
    </div>
</template>
 
<script>
import { ref } from "vue";
export default {
    name: "ref",
    setup(){
        const mycount = ref(2);
        const changeMyCount = ()=>{
            mycount.value = mycount.value + 2 ;
        }
        
        return {
            mycount,
            changeMyCount,
        }
    }
};
</script>

<template>
    <div>
        <div ref="box"><button>hehe</button></div>
    </div>
</template>
 
<script>
import { ref } from "vue";
export default {
    name: "ref",
    setup(){
        const box = ref(null)
        onMounted(()=>{
            console.log(box.value)
        })
    }
};
</script>