performance of font-lock-fontify-keywords-region
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fommil commented
I'm not sure if this is scala-mode
doing this, but Emacs started running really slowly for me in a big file and I took a profile-report:
- redisplay_internal (C function) 3129 74%
- jit-lock-function 3121 74%
- jit-lock-fontify-now 3121 74%
- funcall 3121 74%
- #<compiled 0xb3e4c9> 3121 74%
- run-hook-with-args 3121 74%
- font-lock-fontify-region 3121 74%
- font-lock-default-fontify-region 3121 74%
- font-lock-fontify-keywords-region 3093 74%
+ eval 112 2%
+ scala-font-lock:mark-pattern1-part 39 0%
scala-font-lock:mark-reserved-symbols 36 0%
+ scala-font-lock:mark-integerLiteral 8 0%
scala-font-lock:mark-underscore 8 0%
+ font-lock-fontify-syntactically-region 28 0%
it all seems to be internal work in the font-lock-fontify-keywords-region
can you think of anything that might be causing a problem in scala-mode
? I assume it is scala-mode
that is defining the keywords for the mode.
Sadly I can't share the file with you, but if I can ever reproduce in a public project, most definitely. Probably for the best, this file would burn your retinas.
fommil commented
This issue was moved to ensime/ensime-emacs#227