I've had a couple of comments about Uplighter running very slow, all from people with 3 ghz cpus. Which is weird since it runs smoothly on my computer with 1.8 ghz. I'm pondering whether I've screwed up any of the timing code, but I don't know yet, and thus I have no recommended fix yet either. Update: Codexus has gotten it to work by simply compiling it in MSVC. Here's a link. Thanks Codexus!
Also, Uplighter will, per default, use as much cpu time as it can. Some people do not seem to like this, but it should be easy to fix: Either enable vsync for OpenGL, or try running Uplighter with the -cpufriendly switch.