I also switched from LastPass to Bitwarden, and over the past couple years of using it I have had zero criticisms.
My only complaint about bitwarden is that folder management in the macos app is not great. Adding passwords to new folders requires writing in the entire directory path. And i have to memorize the entirety of it, writing it incorrectly leads it to create new directories with those badly spelled names.
Anyway I decided to move to bitwarden last week and it works pretty great. No noticeable slowdown at all.