I don't know if any one has noticed that doom 3 is slow. People are pi$$ed cause the min specs are far to low. What would be the point of buying a game that laggs. I by no means have a "beast" pc but i managed to squeeze huge FPS's out of a badly made game. ID should actually do a survey on peoples hardware and make the game based on the majority.
Far cry was about 4 gig, UT2004 was 5.5 gig....Doom 3 1.4 gig. Something wrong there. They compress everything, so when u need it the game in real time has to uncompress it. go into your doom3/base dir, and use winRAR/winACE to open all the ***.pk4 files. there are 4 of them. open them and extract them to the base directory (the same place you got the .pk4 from). *WARNING* Once finished keep the .pk4 files as you need them for MP, this is a SP solution. This will also make you DOOM 3 folder with out those .pk4 files 4.4 gig. This makes a huge difference though.
you can also open DoomConfig.cfg (C:\games\doom3\base) in notepad and change (make sure to save a backup copy) seta image_cacheMegs "32" to a higher number, such as 128 or 265 (depends on RAM, use 256 for a gig, 128 for 512mb) you will see a big increase too. You also have to change the seta image_useCache to "1" and seta image_cacheMinK to approx "20480" (or higher)
There you have it, since the CPU wont have to unpack the textures, sounds, etc...there is a MASSIVE performance increase at the expense of no Multi Play and requiring more HDD space.
There is no peace without war!!!