[perf] Investigate TerminalLinkDetector#_parseWords performance

[jrieken]

re #170954

Automatic renderer profiling points towards _parseWords as being a cause for freezes. For 1.75.0-insiders we are seeing ~50 reports where this function was running for 350-500ms

This is a trace from todays insiders

c#workbench.desktop.main.js:1120,20208
detect#workbench.desktop.main.js:1120,19514
<h#workbench.desktop.main.js:1092,7040
<provideLinks#workbench.desktop.main.js:1092,6962
<_askForLink#xterm.js:1,11082
<(anonymous)#xterm.js:1,15056
<fire#xterm.js:1,136295
<_renderRows#xterm.js:1,99952
<(anonymous)#xterm.js:1,97951
<_innerRefresh#xterm.js:1,19939
<(anonymous)#xterm.js:1,19898

[Tyriar]

Struggling a bit with a repro. I managed to repro it with some pretty unrealistic circumstances:

The above was made by adding this setting:

"terminal.integrated.wordSeparators": " ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ 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()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’ ()[]{}',\"`─‘’"

Then mousing over this (cat long file and zoom out the workbench):

I'll optimize against this and hope it goes away in telemetry.

[jrieken]

Verifying these perf-issues is really hard - automatic stack trace profiling has more in common with error telemetry than traditional bugs.

@Tyriar Tho, having said that I did look into the code and do I believe looping over a string to find word-gap characters isn't the fastest option. I didn't measure and it is counter intuitive but I am very certain the using a String#split with a regex is faster.

[Tyriar]

@jrieken TIL you could split using a regex 🤯. It was quite fast based on my testing when I did the PR, the reason I didn't try a regex approach as regex escaping a user-defined string seems error prone.

[jrieken]

escapeRegExpCharacters might help with handling user-defined strings. This should be measured but I remember we have been floored by the regexp performance a couple of times - it makes sense when you consider JS/native context switches

[Tyriar]

Handy, will reopen for next milestone