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Tuesday, February 21, 2006
 

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Readers Report DOOM 3 Speed Increases
8:05 AM | Tuncer Deniz | 7 comments

A day after the release of the DOOM 3 1.3 Rev A patch, IMG readers are reporting impressive speed improvements, especially with ATI based Macs. Aspyr's Glenda Adams posted in the IMG forum and explains that the speed increase is due to an OpenGL option that allows the game to submit information for the next frame in the game.

Glenda Adams explains:

There is a GL option ATI had us turn on for their cards that basically lets the game get a little bit farther ahead rendering while the card catches up. This is something that happens on the PC by default. What happens is while GL & the video card are drawing the last frame Doom submitted, the game can continue submitting information to GL for the next frame instead of stalling. This evens out the frame rate spikes (one slow frame doesn't completely kill you), and lets the CPU do a little extra work while the video card is finishing up.

This was one of the GL/driver level changes that was beyond our control to fix inside of Doom. So it was great to have ATI give us a way to turn it on.

One IMG reader, Doomer, reported results before and after applying the patch. This test was performed on a Dual G5 at 800 x 600 resolution:
Before update:
timedemo demo1
1st run: 23.5 FPS
2nd run: 27 FPS

After update:
timedemo demo1
1st run: 32.1 FPS
2nd run: 40.4 FPS

Another IMG reader, iRolley, also reported some good results on an Intel iMac:
timedemo 1
1024 x 640 : 43 fps
1024 x 640 (2x AA) : 37 fps
1024 x 768: 40 fps
1280 x 800: 33 fps
Be sure to stop by the IMG forum and report your findings.

If you own DOOM 3 and haven't done so already, the 1.3 Rev A patch is available at Macgamefiles.com.

IMG Forum: DOOM 3 Universal Binary Thread
MGF: DOOM 3 1.3 Rev A Patch
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Archives  News  Readers Report DOOM 3 Speed Increases