I've had a look and produced some patches/configuration examples that allow roundcube delivered faster due to compression and more effectively cached by browsers[1].
Using compression the static pages reduced the size of the page after login from a few hundred k to just over one. The effects of caching mean that a logout and log back in only fetch a single index page[1] and all images, css and javascript are cached
The lightty configuration described in the INSTALL file even keeps a cached compressed version of the static files for lower server load.
I'm sure there are sysadmins and developers here with more experience running websites that me so if see any problems or improvements with these patches make a comment on the bug.
[1] http://trac.roundcube.net/ticket/1485800 [2] the javascript page mentioned in stats was removed in r2402
Daniel Black
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