Ive tested qupzilla and Palemoon, palemoon do weirds thing likes rendering with movil look layout some pages, qupzilla seems to work better, i dont like them..
I always come back to a browser based on chrome, so I went to Chrome Changelog version history ,and to opera pub, to trace the version engine used for each opera version, and to the Chrome's changelog to see what version might consider to install in order to performance.
https://en.wikipedia.org/wiki/Google_Ch ... on_historyhttps://ftp.opera.com/pub/opera/desktop/I installed some opera versions with differents chrome engines/ javascript engines, tested performances, and curiously, i couldnt improve what i already had (Opera v42.x.517). Opera v42.x.517 --> Chrome/55.0.2883.87
Operav42 is a compilation from 26-Jan-2017, so its a worthy browser, still a young one to come into engine features obsolescence.
--> I recommned OperaV42 or OperaV44 if you are getting some lag with web pages.
There are lighters and fater Opera versions for older pc's such as Opera (26-29) using earliers chrome engines (from Dec-2014 on), but they give you a gui version of opera some poor. And a closer chrome engine to obsolescence web features.