Setting foldmethod and foldexpr to treesitter affect terminal buffer

[asmodeus812]

Problem

Terminal buffers receiving streaming data foldexpr set to treesitter lock up the main thread, rendering nvim virtually inoperable.

Minimal repro

pcall(vim.treesitter.start)
vim.cmd.split()
vim.cmd.term()
vim.wo.foldmethod = "expr" -- use treesitter folds
vim.wo.foldexpr = "v:lua.vim.treesitter.foldexpr()"
vim.bo.filetype = "baseterm"

Then run the following in the terminal

while true; do echo test; done

Now if you exit terminal mode and try to navigate to the first split with the [No name] buffer and start typing, go in normal mode and try to move the cursor back/forward ([b] and [w]). There is a significant lag in every motion.

Expected behavior

Terminal data streaming should not lock up nvim.

[asmodeus812]

Small correction, seems like foldmethod is affecting this greatly, discovered that the global config that i had enabled - vim.o.foldmethod="expr" along with vim.o.foldexpr = "v:lua.vim.treesitter.foldexpr()" , was getting applied to the terminal buffer, and that is what seems to be destroying the perofrmance, even though the treesitter is not active in that buffer.