Yea, IMO Firefox 57 is about Firefox finally being able to compete with Chrome in terms of speed. This is easily the main reason Chrome ever took over (that, and Google aggressively advertising it and borderline malware-installing it in bundles of other software). I'd say Chrome and Firefox are identical now in terms of general snappiness and ease of use and it's giving Firefox a chance to actually race ahead with more smart improvements in the future and a believable commitment to protecting its users from aggressive data-leeching and advertising.