1. Without composition & decoration

2. With Compiz & Metacity

* In both instances moving to close Glxgears lowered the average a little.
** Both tests only use the replacement r600.so from the unofficial Mesa while everything else is installed normally.
*** The graphics card is a HD5870 aka "Cypress".
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After the recent upgrade of Firefox to a supposedly Linux-optimised version the improvement is marginal at best and the status of Firefox at least on Lubuntu if not Linux entirely continues to be lousy, especially regarding Javascript.
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Hey Xeno man your Win driver really helped and I tend to fully investigate the emulation capabilities of my current setup.
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LibreOffice 5 is really good.
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The big update replaced some major files so in order of getting Compiz to work you need to repeat the procedure I wrote in a comment on this posting and also reconfigure Compiz's settings via its preferences utility which is a GUI and straightforward.