Elsewhere in the comments section there were tips about an addon that tells if one of your addons is blocking e10s. Another useful tip was the dom.ipc.processCo

Elsewhere in the comments section there were tips about an addon that tells if one of your addons is blocking e10s. Another useful tip was the dom.ipc.processCount setting. Before I cancelled my LastPass account I was using the 3.x version from them, which doesn't support e10s and crashed the browser when I forced it on. But still I was able to turn it on even though the browser was unusable. I run this on Arch and Wayland, which might also add to the snappyness. What I kind of observed from all the comments was, that the OSX users were complaining the most about the slowness. Might be that the Linux version is faster then.