gEDA-user: My Xorg uses large amounts of CPU when using PCB

[Cory Cross <crcross@xxxxxxx>]

Hi all,

I don't know where to even start trying to figure out this problem. If 
you can give me a clue, I would very much appreciate it.

I have identical builds of a recent git version pcb on my laptop and 
desktop and a few other machines. PCB runs just fine on everything but 
my desktop. On the laptop, Xorg uses ~10% more CPU than PCB (so, if pcb 
is ~11% CPU then Xorg has ~12% CPU). But on the desktop, just zooming 
causes ~90% CPU for Xorg and 4% for pcb. Playing with firefox doesn't 
cause Xorg to even hit 1%, so it's definitely an Xorg<->pcb combination 
problem. Obviously, this causes extreme lag when using PCB.

I've had this problem for a couple years across different versions of 
PCB, but I finally upgraded my desktop recently (was stuck on ~2yr-old 
debian for unrelated reasons) and expected the problem to go away. No 
such luck. It may have even gotten worse.

My specs are below; perhaps there is some operation that PCB does that 
is ridiculously slow on radeon drivers? If this was PCB using up 
processor I'd know where to begin, but I know nothing about debugging 
Xorg...

Thanks for any help you can offer,
Cory

Laptop & Desktop both run Debian unstable with Linux 2.6.32 for 686, 
Xorg 1.7.7
Laptop uses intel driver for 945GM/GMS/GME, 943/940GML Express
Desktop uses open-source radeon driver for Radeon 9250

Desktop is dual-monitor merged, but still has a problem with a single 
monitor setup. Using the vesa driver at a low refresh rate causes fast 
reaction, but Xorg is still using twice the CPU PCB is.


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