I was wondering if Tracker was enabled or disabled in the later versions of Ubuntu. One thing I noticed right away in Ubuntu 7.10 when I started compiling larger projects is that there was a huge performance hit taken with Tracker enabled. I would download a tarball, decompress it, and tracker would index all of these new text files... not good, especially for a large project. Then, as I was compiling, Tracker would notice these new files created during compilation and start indexing them as well. Disabling Tracker completely helped general performance quite a bit as well and it's one of the first things I do when I perform a fresh install of Ubuntu.
When it comes to comments on the completely fair scheduler, there may be a small performance hit taken, but the general user experience is much more smooth on the desktop. If there is a single application that runs a muck, it's not going to make your desktop completely unusable to the point of stopping the user from killing the wild process. For me, that's a trade off I can accept.
For the graphics tests (minus the games tests), I would be interested to see what the performance is like if we take the proprietary ATI drivers out of the mix. I realize that many (if not most) users will be using the proprietary drivers, but I'm curious to see if some of these slow downs have been introduced by ATI.
I'm not denying for one second that there is a problem here (it seems pretty apparent there's a problem with the kernel, X, GTK, or some combination of those), but these are just a few questions and opinions about what the causes might be.
The makeflags set by PTS is set to 4 jobs for physical dual core systems.
If MAKEFLAGS was set like this in all Ubuntu versions then.... wow, what causes this massive performance drop?! If i find some time i would like to do some benchmarks on my own, but with a different distribution.