DOOM3 speedup tweak??

[Tjalfe]

from this forum:
http://www.forumplanet.com/planetdoo...33&tid=1438663

I dunno if it's just me, but I noticed this trick beefed up my DOOM3 performance by a lot.

Anyhoo:

In your DOOM 3 directory, find "DoomConfig.cfg" (x:\Program Files\Doom 3\base). Open DoomConfig.cfg in Notepad.

Find the line:

seta image_cacheMegs "32"

I changed 32 to 96.

I got a nice boost in performance. I dunno if the tweak worked or not (maybe my machine did something wierd, have no clue), so I'm just seeing if this works for others as well, or if a different setting works better than others..

can someone with the game verify if there is any truth to this?

[bsdgeek]

Didn't help me much.

[Tjalfe]

well any help is good I suppose.. what number did you set it at?.. the guy in the thread tried as high as 384

[bsdgeek]

Tried 96 & 128.

[Tjalfe]

how much of a difference did it make, and on what hardware?

[DGhost]

interesting. mine is set to 20. of course, the line right above it seta image_usecache is set to "0"...

[bsdgeek]

Originally posted by DGhost
interesting. mine is set to 20. of course, the line right above it seta image_usecache is set to "0"...

D'oh! Feel a bit silly now. Mine was the same, no wonder it made no difference.

It just crashes with usecache on.

[Paddy the wak]

I'm confused ... I know that is easily done ... but ... is it helping or not ? ....

[Admiral]

Well, it's helping me, it runs much smoother now, no pauses.

[Helevitia]

There is a write up on it. Check out this thread and this one

Dave

[duke_srg]

It seems that D3 performance mostly depends on CPU. At least with Matrox P-series. I have P4 2.6@3.0 (230FSB)/1Gb/P750.
And timedemo demo1 FPS is the same for standard and OC mode of video card (usually there is a 10-20% FPS). And even more - the FPS is the same for all filtering modes from GL_NEAREST to GL_LINEAR_MIPMAP_LINEAR - that is nonsence!!!

[DGhost]

its not nonsense. it's Matrox and a very poor OpenGL ICD.

Let me, for a moment, recall working on Tenebrae. Since it is a source based mod of the Quake engine, I spent a fair amount of time mucking around with GLQuake. the results I had for the P were pretty much startling. i never got it to break 115 FPS with *GLQuake* in a timedemo - no matter what tweaking I did, it wouldn't go any higher. I could enable features all I wanted, and it would only drop maybe 5fps per feature, but it never saw any huge performance benefit from anything.

compare this to an ATI or GeForce running the same thing. they would easily break 300FPS on a GL Quake timedemo, but saw much larger drops in FPS for every feature that you enabled.

As I recall, I never was able to get Q3 to break about 85 FPS on my P, where as an 8500 was often seen breaking 250 FPS at the same time.

anyways, where am I getting to with this... this is one of the underlying problems with the Parhelia (or at least its OpenGL stack) - it is not efficent. it does not run nearly as fast as any other manufacturers. you don't loose as much performance for enabling certain features, but it is not a high performing OpenGL ICD to begin with.

Doom3 makes the problem worse. it demands enough from the drivers that a High Performance solution really is required. the little tweaks are not enough to get any performance difference out of it - it requires disabling of the major features (That the Parhelia was supposedly adapt to, according to Matrox) in order to even pull a playable framerate.

[leech]

Want to hear some really narfed up OpenGL performance... out of curiousity, I was running FRAPS on Call of Duty (with the 1.4 patch) and while I was inside, I was getting about 160-180 fps. But as soon as I went outside where there is a waterfall.... it droped to about 15 fps, then jumped to about 40 while I was outside, maybe it was due to it having to load up textures and my hard drive is probably pretty fragmented.... but holy crap, what a difference.

This is on my Geforce 6800 GT, and my PC has a 3.06ghz P4 w/HT and 512mb of RAM.

Leech