Hi Appleuser201,
Have you tried ArcticFoxPPC. I think it's lighter on resources and it has the hability to
set a specific useragent for different sites/domains, by going into about:config and adding a
new String preference like:
general.useragent.override.google.com
With the value for the useragent you want to use like chrome 41:
Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2226.0 Safari/537.36
I've seen that several sites behave better/faster with more or less the same functionality.
In google sites like gmail using chrome 45 is the minimum for the regular version but loading
times are still slow because of javascript code but after loading it's "usable" on a PB G4.
Also using umatrix and ublock origin make a big difference.
Best regards,
voidRunner