Hi,
Is it only me, or in Vim with the syntax highlighting enabled for Rust, whole Vim gets slow? As soon as I do :syntax off, slowness disappear. I don't have such problems with other file formats.
It's not just you.
Sometimes it seems like it just hangs for a second or two. Especially when adding new stuff near the bottom of a longer file.
I too have noticed this. The larger the file, the more sluggish it becomes.
I haven't encountered this in Rust yet since I'm not yet working on large files, but I had the same problem in vim with python syntax highlighting (also fast after :syntax off. I switched to NeoVim for this reason, this fixed the performance problem of the python syntax highlighting. May be NeoVim has a faster scripting or RegEx engine underneath, not sure.