Quantum is allegedly faster and takes less memory. The page title is "2x faster and 30% less memory". That's far from true, in my experience. Before, it took between 400MB & 500MB with just a single process. Now, it's split into multiple processes. One tab open and I see at least four processes, each taking between 150MB and 300MB, for a collective total of around 750MB . As far as speed, hard to say. I have a fast connection, so Firefox has generally been fast with it being noticeably slow on Facebook. It's still slow on Facebook, and I blame Facebook for that, not the browser. I definitely wouldn't say 2x faster, and instead of 30% less memory, I'd say 30% MORE memory.