Horrible frame rates; Texture LOD Bias to blame??
So I am having more problems with frame rate issues in this game than with any game I've ever tried to play on this system. I'm running with a quad-core AMD 3.0 GHz CPU, Radeon R7850 with 2 GB memory and 12 GB RAM on Windows 7 64-bit. This is the only game I've ever had poor performance on.
In troubleshooting, I've found that even anti-aliasing and V-Sync have no effect. Instead, I have to mess with the Texture LOD Bias setting. Depending on the game's mood, I either have to turn this all the way up, or all the way down. Case in point: I turned off V-Sync and enabled 8x anti-aliasing this morning; then I disabled AA and had absolutely no impact on performance. Then I turned the Texture LOD Bias all the way up from its default, and the game became playable. Well, 10 hours later, I fire the game back up and go straight in, and the frame rate is unplayable again! So I turned the Texture LOD Bias completely OFF, and the game smoothed right out. I'm not well-versed on graphical settings and don't know what this one does, but whatever it does, it's the only thing making the game playable, and it looks like I'll have to adjust it every time I start the game. This is very annoying, and now that the game has (supposedly) matured, bugs like this should already have been patched out. (Also, that nice little crash where you have to replace one of the AMD video driver files with one from an old version and put it in your Doom 3 BFG folder; yeah, that happened to me this morning, too).
So I'm just wondering if anyone else has had horrible frame rate issues, what they did to resolve it, and if this setting has affected any else's system. Would have to hear some more thoughts on this.