[sldev] Why is framerate so much lower in my viewer builds?

[Khyota]

Ive tested 6 linux builds already in a controlled setting same postion, same 
graphics settings res(640x480) no changes in the sim, etc. After all textures 
are loaded i check the framerate.

Im on openSuSE 11.0 x86_64 AMD Athlon 64 3200 Geforce 8400gs

I built the (standalone) realease tarball, trunk, and openal branch w/o openal 
(no audio in any of those) and w openal for audio :) (no mozlib in any) . I 
also grabed the official release and the build service build from 
here which im going to call the marvin24, marvin 24 is the older 1.20.17 w 
Scons, it does not use kdu either.

http://download.opensuse.org/repositories/home:/marvin24/openSUSE_11.0

The realease tarball, trunk, and openal w/o openal all acheived around 31-34 
fps. Openal w openal slowed down to about 28-30. extra cpu power for audio?

But amazingly both the offical release and the marvin24 build ran at 48-50fps! 

Are there any optimizations that i could be missing?

I took a screenshot in the trunk and offical builds with the frame texture and 
the fps thing whatver its called open just incase anyone can catch something. 
(fps goes down when i take a snapshot though)
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