How to debug slowness when switching from insert mode to normal mode in slightly larger files?

[not-a-doctor-stromberg]

Hi! I have a markdown file that's 151k. When I switch from insert mode to normal mode, there is often a several second pause -- 5 to 10 seconds before I am actually returned to normal mode. This pause doesn't happen for smaller files. Any ideas on what plugins might be causing this? I'm new to lazyvim in general -- I'd guess the appropriate debugging strategy here would be to disable plugins one by one until I find one which appears to cause the slowness, but perhaps there is a better way? For example, is there a way that I could see which scripts / plugins are triggered by returning from insert mode to normal mode?

I'm on an ARM device (Pinenote) running neovim 0.9.1. I updated all plugins as well. Checkhealth looks okay, though I can post results if it's helpful.

Thank you for any help!

[Shougo]

You can check InsertLeave auto commands.
:verbose autocmd InsertLeave