Terminal becomes extremely laggy after printing large amount of CJK characters

### Windows Terminal version

1.20.11381.0

### Windows build number

10.0.19045.4412

### Other Software

_No response_

### Steps to reproduce

```python
s = '打印一个非常长的中文句子，啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊'
for _ in range(100):
print(s)
```

```js
var s = '打印一个非常长的中文句子，啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊'
for (var i = 0; i < 100; i++) { console.log(s) }
```

Run any of the above script (`python` or `node`) in a WT tab.

### Expected Behavior

It prints all the lines very quickly and you can scroll the window with ease.

### Actual Behavior

It becomes very laggy (takes seconds to print the whole thing) and after printing, the whole window becomes very laggy, you can barely scroll back and forth.

-------------

So, this problem is tricky because I can't find a reliable way to reproduce it.
All I can confirm is that:

The issue only started to happen in recent months.

It usually starts to happen after I use my computer for extended time (I leave my computer on 24/7). And once it started to appear, it will affect all the Terminal windows, old or new. And it does not matter which type, can reproduce in CMD, PS, PS7 etc.

Furthermore, once the bug appears, the only way I can fix it is by restarting my computer.

It only happens when printing large amount CJK characters (Chinese, Japanese, etc.). Printing ASCII characters are fine.

Start by running the Python or Node.js reproduction in a Windows Terminal tab and compare CJK output with ASCII after extended system uptime. The report names no source file or test entry point, and done would require identifying and fixing the lag while preserving fast printing and scrolling.

Written by the indexing model from the issue text.