Re: Comprehensive JSX support in Emacs

[Jackson Ray Hamilton]

I pushed a few changes (“Optimize js-jsx--matching-close-tag-pos”, 
“Optimize js-jsx--enclosing-tag-pos”) which made a big difference in 
performance.

I was running a function thousands of extra times redundantly. ELP 
showed that by caching the results, I was able to cut the average 
waiting time immediately after editing a line by 80%. This made editing 
some code noticeably more bearable.

There might be some better algorithms that can improve the performance 
even more, but it should be good enough (especially for non-monolithic, 
well-modularized code) to no longer be a limiting factor for merging it.

Jackson