打开50万字符以上的md卡的飞起

[LovelyLuLu]

• Searched existing issues to avoid creating duplicates.

• Confirmed that it can be reproduced in built-in themes without customized css.

  If it only exists in 3rd party themes or css, you can still report it, but please attach the theme target or the css file. We may not "fix" it, if it is caused by 3rd party themes or css styles that we cannot support.

• Searched http://support.typora.io/

---

Describe the bug
打开50万字符以上的md卡的飞起，特别卡顿

To Reproduce
只需要打开一个50万左右字符的md，软件非常卡

Expected behavior
应该优化一下大型md打开的速度和流畅度

Screenshots / Screencasts

Sample Markdown File

CMOS射频集成电路设计第二版.md

Desktop (please complete the following information):

• OS: windows11 64bit

Typora Version
e.g: 1.9.5

Additional context
Add any other context about the problem here.