Terminal becomes extremely laggy after printing large amount of CJK characters #17414
Labels
Issue-Bug
It either shouldn't be doing this or needs an investigation.
Needs-Attention
The core contributors need to come back around and look at this ASAP.
Needs-Triage
It's a new issue that the core contributor team needs to triage at the next triage meeting
Windows Terminal version
1.20.11381.0
Windows build number
10.0.19045.4412
Other Software
No response
Steps to reproduce
Run any of the above script (
python
ornode
) 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.
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