Do you use ad blockers?
I never used to, but recently on my home PC I started to use a modified hosts file to stop the PC from connecting to malicious ip addresses. This hosts file also blocked many advertising urls and ip addresses too.
One thing i have noticed is that the brwoser has become a lot more stable since I have started to do this and sites load faster too.
It has had such a big impact that at work when I got annoyed by some browser freezes, I gave in and installed "ublock Origin". Since then I do not think I have experienced a slowdown, freeze or crash.
Many websites (I am looking at you Wired!) will complain when you use adblocking software, but having experienced how much smoother the internet connection is by blocking them, I cant see myself going back unless the advertisers significantly clean up the experience - which I cant see happening.