I posted this in another thread, but I shall repeat it here.
I'm not going to say one browser is better than another. I spent a lot of time in chat rooms and one thing I noticed is people complain a lot about browsers performance. A specific browser can seem to work great for some people and work poorly for others. Just because browser works great for you does not mean it's going to work great for the next person. They might get better performance from a different browser. There seems to be several different factors that can cause this. Sites you visit, extensions you use and the combination thereof, what processes may be running in the background, what programs or how many are being used at a specific time. Even your Internet connection, and nodes in the area, relay switches even your ISP hub.
Each individual is going to have a different experience with each browser. It's up to the individual to experiment with each browser and decide on which one works best for them. After MS-DOS I use Windows computers from 95 until 2007 and every operating system during those years. For the first few years of that time Firefox worked best for me. But later on I found Opera worked better for me (because it required less extensions because most of the features were built within Opera) on Windows. When I switch to Macs in 2007 for the firstOpera did not provide the same performance value on the Mac. I always keep a copy of Firefox, Opera, Chromium (Google Chrome minus the tracking crap built in) and Safari. I find Safari works best for me over the others. So Safari is my default browser, Firefox seems to work second-best which makes it my alternative browser. I keep Chromium and Opera at hand which seem to work not as good as the other two but may be required for better performance on some websites (but only a few).
So for me and from my experience Safari performs best for me on my computer with my configuration and usage.