If the slowdown is sufficiently bad and it's happening on Windows then you can always record an ETW trace (https://support.google.com/chrome/a/answer/9025467) and share it with me. My DMs are open: https://twitter.com/brucedawson0xb
I've resolved a few Chrome performance issues due to strangers on the internet sharing ETW traces with me, and analyzing those traces is actually my day job.
Sorry for the late response. This was on Windows yes but it must've been fixed by now as I very rarely reset profiles and haven't experienced this since.
I'll keep your offer in the back of my head tho, thanks!