What software/OS/hardware/DB are we using? I know its all basically donated by you, but perhaps someone out there has a spare that can be donated to improve?
I see lots of wait time in FF/firbug or chrome/dev tools, and transfer time looks quite spiffy (88ms for the largest file which is 1/3 of a MB, and almost half the total bandwith) so I suspect you are either disk IO bound or processor bound or some of each... In this day and age, hardware is about a 10th of the cost of labor (except when the labor is free). I'd be terribly surprised if there was any significant gains in speed via upgrading, and in most cases new versions of software often do more stuff, but often this bloat actually makes them slower...
It is obviously a soak on your time... just wondering what it takes to save you some time
