Assassins Creed 2 framerate issue/GPU usage

Jono8 · 30 May 2011 at 09:09

Bought this game in the steam sale and am having a bit of an issue with it. Basically ,the framerate will be fine (well above 60) for a while until all of sudden there will be pockets on the map where the framerate will tank to like ~20fps. If i ALT-TAB out of the game and go straight back in again, the framerate will be back to normal again.

I have also noticed that GPU usage is like ~40% and drops to 25% when the framerate goes silly. I don't think it is a CPU bottleneck....

Specs: i5 2500k @4.6GHZ, 480GTX, 8GB DDR3

Anyone else had any problems?

Jono8 · 30 May 2011 at 10:14

oxygene said:
Its a big open world, it could possibly be just loading a new area?

No i don't think it is that because the framerate will stay low in that area until i alt-tab out and back in again.

i don't know why GPU usage is so low with 8 x multisampling and 16x AF at 1920x1080 :confused:

Jono8 · 30 May 2011 at 10:31

RedStarRiot said:
were they not poorly optimized for pc? id update all your drivers when and seen how it goes, also verify the game cache in steam properties. I have lag spikes in mass effect 2 ages ago and was my sound drivers.

All drivers are up to date.

Actually i might try the sound thing. I use an audio/interface usb sound card thing so this might be causing some issues ( it usually doesnt though).

Jono8 · 30 May 2011 at 11:20

Might try using onboard sound and see if that makes a difference. It is still perfectly playable but just a little irritating.

Jono8 · 30 May 2011 at 12:55

Parky said:
I've noticed this happening with TDU2 and Shogun 2, It's only started happening since I updated to the new Beta drivers. It's annoying because if I roll back drivers my Witcher 2 performance goes out the window.

Maybe i will try the old drivers then. Although the newer BETA drivers actually gave me a few more frames in Shogun

Oh the joys of PC gaming!

Jono8 · 30 May 2011 at 13:33

CaptainRAVE said:
Sounds like you need a fresh driver install. Completely reinstalling windows fixed the multiple driver issues that I was having - even driver sweeper didn't seem to fix it.

Only have a problem in this game so far. Everything else works perfectly. Might try rolling back to the WHQL.

Jono8 · 30 May 2011 at 19:23

Started the game up again this evening. Was running without a hitch. However, after alt-tabbing in and out countless times it started to do the weird framerate glitch again.

I wouldnt put it past the stupid DRM thing to be honest casuing hiccups

Il play it more later for a while without alt-tabbing and see if it does it all.

Jono8 · 31 May 2011 at 00:58

Interestingly, i think it only happens if i keep alt tabing out of the game. Just sat back and played almost 2 hours straight and it didnt lag once. Played perfectly the whole time.

I don't know why alt-tabbing a lot upsets it but oh well.

Loving the game so far by the way. £6.80 well spent

Jono8 · 31 May 2011 at 15:18

Just to confirm,this is definitely an issue with continuously alt-tabbing out of the game. If the framerate glitch starts to happen i have to restart the game to fix it.

If i don't alt-tab out and back in again much or at all it plays perfectly.

Don't know why it would cause that to happen but hey, i will just have to be less distracted and actually play the game solidly rather than flit in and out every couple of minutes