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Add tree-sitter performance note

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Yuan Fu 2023-09-13 17:56:07 -07:00
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TREE-SITTER PERFORMANCE NOTES -*- org -*-
* Facts
Incremental parsing of a few characters worth of edit usually takes
less than 0.1ms. If it takes longer than that, something is wrong. There’s one time where I found tree-sitter-c takes ~30ms to incremental parse. Updating to the latest version of tree-sitter-c solves it, so I didn’t investigate further.
The ranges set for a parser doesn’t grow when you insert text into a
range, so you have to update the ranges every time before
parsing. Fortunately, changing ranges doesn’t invalidate incremental
parsing, so there isn’t any performance lost in update ranges
frequently.