I don't think git uses copy_file_range yet (at least I can't find it looking through its source), so it'll make expensive copies for each worktree. And he said

I don't think git uses copy_file_range yet (at least I can't find it looking through its source), so it'll make expensive copies for each worktree. And he said even deleting the diffs in an overlay is too expensive, which normally should be cheaper than deleting a worktree.