This has become a point of friction and irritation after some months of use for me too. The app in the browser (but also on my Android phone) feels overly slow and unresponsive due to the animations.
At the very least there should be an option available in the settings to disable all animations, although I think it would be wise to change the default behavior too.
My company is in the process of evaluating Bitwarden as the default password manager for our customers, potentially selling many Enterprise Licenses in the years to come. Other than the missing multi-account feature, this is the only pain point that we would like to see changed.