I’ve mentioned this somewhere else in the forums, please check here:
Although you should keep in mind that Bitwarden is under constant development. There’s a lot of stuff going behind the scenes. I’d like to see them on the roadmap, but that’s still a long way to go. Kyle and his team got higher priorities. But I’m not afraid to tell that I’m pretty excited with the project so far and that I’ve migrated to it (probably) in the right time. I’m pretty satisfied with my decision so far. 
EDIT: However, I guess you’re right about the memory consumption between uBlock and BW itself. We have to consider the constant sync and overall UI, though. Besides other hidden elements, etc, etc.
Nothing much that can be done for now, but sit and wait. Or even buy him a coffee, meanwhile. 
EDIT2: Just re-enabled LP for a quick test and got a surprise:
Although it’s much more glitchy than BW. Anyway, 8 GB RAM can handle that easily. I tend to keep lots and lots of tabs open. Sometimes it slows down, but I tend to unload tabs for better experience.