Firefox is much slower after the upgrade, and
htop tells me that Firefox mostly uses only one CPU core, instead of distributing the load. Most importantly, Facebook is next to unusable after the upgrade to 18.04.
Steps I've already taken:
- Enabling hardware acceleration in about:config
- Using uBlock Origin to mitigate requests and traffic from third-party sites (as I did before)
- Installed the Nvidia GPU drivers through Settings Manager
Incidentally, Core 4 seems to carry most of the Firefox load. I've never seen it jump to another core.