选择元素时，在输入时缓慢渲染文本

[thinh1995]

Reproduction link
https://codesandbox.io/s/vue-template-9chst

我选择了一个国家，然后在输入中输入文字。 显示文本很慢。 为什么？
如果我在页面上有很多选择，输入显示文本会更慢。
请帮帮我！！！

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