An occasional 100ms pause while I'm editing a huge 1GB file wouldn't be a deal-breaker for me, as long as regular-sized files have <10ms latency. It's been a long time since I opened a text file that huge, and I think the editor I was using at the time chugged something awful.

VSCode is slightly laggy for me just editing a 10k line text file, so my standards are sadly not that high, even though I find typing latency really annoying.