Not sure whether it is a bug or not but here's the issue: When I change shadow quality it has really huge FPS impact. Bigger than anything else. On high settings the FPS is like 15-25, on medium it struggles occasionally and on low it's absolutely smooth. Strangely, the FPS depends on the number of torches I encounter. When I didn't encounter many torches I played on high but at one point:
beginning of the 3rd level
there were 3 torches in one place and the FPS war totally unbearable on high, barely fine on medium and all right on low (even two torches close to each other are painful). When I tried to lower other settings while preserved high shadows FPS didn't change very much. So my FPS really depends on the number of torches I meet in one place which is quite wierd.
My computer is strong enough to run Oblivion with mods (OOO) at max settings and Skyrim on high (not ultra) flawlessly. I personally think that Skyrim is more shadow-demanding than LoG. However, I now have Ubuntu 11.10 and I run games through Wine but the games I tried worked with the same performance as on Windows (didn't try Oblivion and Skyrim, though).
Here are my specs:
Ubuntu Studio 11.10 & Wine 1.4
CPU 3GHz Dualcore
GPU ATI Radeon HD4800 SE 512MB
RAM 4GB
Did you notice it as well or it's just because of my Linux OS?
Despite the torch thing I'm suprised it runs so well on Wine and I'm really enjoying the game
.