Well, it looks like we have more-or-less a unanimous consensus, must be a first for the Interwebs.

There appears to be a problem with shadows & nVidia cards.

sorry, gtx 260 oc , 196.75 whql's All settings maxed except shadows 30-45fps, shadows on 14-18fps inside sub

I am also using an 8800GTS 640mb. Couple things I have noticed regarding this issue. It is definitely related to shadows and the reason ATI users don't experience it is simple in theory but difficult for NVidia to repair. If I had to guess I would say that DX is attempting to render the shadows and instead of allocating the proper number of pipelines for this, the driver is assigning too many. My card's fan kicks up which confirms this theory.

They are passing DX9 instructions to the GPU, and ATI's is handling it properly but NVIDIA's is not. I debugged for a long time last night trying to identify the difference, but unfortunately without an ATI system to compare I gave up trying to find it blind.

PS, a realtime debug log of DX output goes by so fast while playing that if you manage to read one line I commend you.

Guys -

Keep your eyes on www.nzone.com for "BETA" Nvidia driver releases. These are often 2-3 major revisions ahead of WHQL drivers and often fix tons of issues without having to wait for Microsoft to "certify" them and give them a WHQL label.

Win7 Pro 64, GF8600 here. Latest drivers.
Runs nice on max, only the engine room and interior areas close to it make it slower.
Better without shadows, but still not as good as in bow compartment or "outside".

Thanks for the feedback, hope the devs paid attention. Indeed I can confirm from the other side that on ATI cards, interior performance is in fact noticeably better than exterior. Which points to a compatibility issue for sure.

Geforce 9800GTX+ X2 SLI, VSync 512mb each
Vista X64, SP2
4gb mem

Without any shodows all maxed out 70-120 frames under any circumstances.
With shodows, everything on max 10-20 frames, and jittaring water, Especially slow in Control Room
With shodows, everything on low 20-25 frames, and jittaring water, Especially slow in Control Room

:down:

Win7/64x
Nvidia Geforce 9400 GT
Fraps are bad in Control room,Watch tower a bit and The Diesel room is by far the slowest:o

9800 GTX here.

Have 15-25 fps with shadows on. 40-60 with shadows off. running AA halfway on it's slider.


If i close a few doors, i get more fps.

Mine is choppy when I'm in the sub, shadows are on the lowest setting. I'll report back tomorrow with results from turning them on and off.

Do we want to report this to Nvidia or wait to hear from the devs?

Windows 7 Pro 64 bit
Core i7 920
Geforce GTX 285
Driver 196.21

Try the new driver (196.75). It's slightly better and gave about 5 extra fps in control room. I have same system as you :)

Dual GTX 280's here. Shadows misbehave (act glitchy) and perform very badly under SLI. Turn off shadows, and all is well.

Probably a driver issue.

got the game i can confirm performance is terrible for nvidia users running a good card here GTX260OC version.

=control room massive frame rate hits?
=external is very glitchy in performance

dev team need to address all round frame rates for nvidia users.

http://www.subsim.com/radioroom/show...87#post1292687

maybe that can help :)

Q6600, 4GB, 280GTX, shadows are definately biggest performance hag, w/o them game runs like a charm.

not to turn this into a ATI v. NVIDIA issue, but it looks more and more like a NVIDIA driver issue.

I spent some time testing the FPS on my system last night.

I have a E8500, ATI 4890 (cat 9.12), 27" Dell WD monitor,creative X-fi fatal1ty soundcard, 2 gigs DDR2, Win XP pro sp3.

running at 1920x1200, max graphics, shadows on, v-sync off, no AA.

Inside the boat the fps always hovers between 60-80 and never goes below 60.

Out on deck in the ocean, fps again between 60-80 even when looking at shadow of boat. Boat shadow is rendered correctly.

The lowest FPS I have seen is 35-40 when on deck leaving harbour in the Narvik single mission. That scene is heavy with scenery and friendly AI ships.

I have never seen any slowdowns with explosions, etc.