@arnan I can't speak to that, I only noticed it was slowed down after having profiles set up. But it wasn't immediate. That being said, another comment prompted me to reduce how long history stays (I save stuff anyways) and which extensions are active on which profiles, and now the window for my work profile opens immediately.

@arnan @richaesthetic I like Firefox best, uBlock origin is my only extension to keep things fast, and it also speeds things up by blocking ads and tracking