slow performance on relative large file (1500 lines)

[phanen]

Repro

Tested with nvim 0.11:

> repro.nix curl https://raw.githubusercontent.com/NixOS/nixpkgs/e14ae009dd2b851991007df7f4bb190d3d6ece88/nixos/tests/all-tests.nix
mkdir -p ~/.local/share/foo/site
ln -sf ~/.local/share/{nvim, foo}/site/queries
ln -sf ~/.local/share/{nvim, foo}/site/parser
time NVIM_APPNAME=foo nvim repro.nix +"let g:_ts_force_sync_parsing = 0" +"lua vim.treesitter.start()" +"lua vim.schedule(vim.cmd.quit)"

It take 3s to load the buffer (~1500 lines) on my machine

________________________________________________________
Executed in    2.94 secs      fish           external
   usr time    8.53 millis  747.00 micros    7.78 millis
   sys time    2.42 millis    0.00 micros    2.42 millis