Slow editing inside large string
@zonuexe is already working on this.
Since Oct 29, 2018.
Assessment
This issue has not been assessed yet.
Description
In this example I made a string of 1000 lines This is a $test, and then typing on line 1000 becomes very slow:

The cpu profiler shows 65% goes to font-lock-fontify-region:

Does anybody know if there is a way to speed up the font locking?
Thanks a lot!
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