I know this has been discussed in the past and I've been one to bring it up, since I'm using a 600Mhz iBook running Ubuntu and OSX.
Just for the information, I've tried various flavors of Linux and Debian seemed faster but I always had to manually configure my Xorg file. Ubuntu never asked any questions and the screen display was just fine. Then running top I noticed that Xorg jumped to 80 or 90 percent of the CPU load when typing in 1.5.0 on Ubuntu. So, I went into the Xorg file and noticed that the default color depth was 24 and it should be a maximum of 16. Changing this "DRAMATICALLY!!!!" changed the speed of standard typing in a new document without figures or notes or anything. So much so that there is absolutely no "slowness" in new documents. However, for longer documents if a figure float is open, then once again the typing speed is diminished and Xorg starts hogging the CPU. So my question is - Why does LyX 1.5.0 cause Xorg to use so much CPU or how this could be decreased? Is this increase just because of Qt 4.x. I guess I'm just being hopeful that I could change a setting again in my xorg.conf and the LyX speed would increase again. Cheers, Bob Lounsbury P.S. I also must give a big THANK YOU! to the developers of this great software. I just completed my thesis using the program and it was amazing.
