Mozilla: Firefox Quantum twice as fast as Firefox six months ago - gHacks Tech News
https://www.ghacks.net/2017/09/26/mozilla-firefox-quantum-twice-as-fast-as-firefox-months-ago/

＞Firefox 57 is twice as fast as Firefox versions that were released six months ago to Mozilla, the organization behind the web browser.
【速報】Firefox 57、6ヶ月前にリリースされたFirefoxの2倍の速さ

マジなのですか？？