I have updated to Firefox 57, I don't know what is working behind the scenes, but it got a lot slower in my ubuntu machine. Before there were some incremental page loading while downloading other assets, but now, some of the sites are loading slower than before.<p>some of them are:<p>http://store.steampowered.com/<p>https://gist.github.com/<p>maybe my configs are not correct or I should switch off something, but Firefox got worse