vue-tsc checks are much slower than they used to be

[k983551019]

vue-tsc checks are much slower than they used to be

[MikeLP]

I have the same issue.

[skywalker512]

I have the same problem. After using --generateTrace, I found that there are still a lot of createSourceFile processes （Occupied half of the time） after checkSourceFile is completed.

trace2.json

https://github.com/skywalker512/volar-2-reproduced

@johnsoncodehk

[MarcelKlammer]

Same here. 2.0.7 was the last fast version, .10, .11, .12 all are extremely slow.

[ghost]

Version: 2.0.12, my project has 1029 files, and it took more than 30 minutes to execute vue-tsc --build --force

[so1ve]

@smh000809 Should be resolved by #4245

[blake-newman]

FYI we found the root cause of the issue and further PR to ammend to fix:

#4260

Assuming its released thought i'd make you aware again incase there is another regression (shouldn't be tho).