Weird 'Lag' Issue In Arma 2 Which Also Occured In Fallout 3!

I installed Arma 2 yesterday and have been playing for a little while now, although I've come across a problem which is EXTREMELY annoying to say the least. Anyway, my specs are below so you can see what I'm running the game on:

OS - Windows XP Home (SP3)
CPU - Intel Core2Duo E8400 3.0ghz
Ram - 3.5gb DDR II
Video Card - 640mb Nvidia GeForce 8800GTS
Nvidia Drivers - 185.85
Power Supply - Thermaltake Toughpower 750w

When loading the game I ALWAYS make sure I close all unecessary background processes such as Anti Virus software, Virus Scanners, etc so that the game runs with around only 20-25 processes running in the background. Anyway, the problem I'm having is that when the game loads up & I start playing the gameplay is smooth as hell with no lag whatsoever which is great. Then around 10 minutes later, all of a sudden I'll just start 'lagging' (not sure if I can really call it lag, but I can't think of any other word for it) for no reason. For example, I'll move my mouse to look around the screen & it'll take almost twice as long for my character to respond & to follow that order, basically the gameplay goes from really fast/smooth to really slow and I have no idea why.

I mean it's not like it's even occuring during a massive firefight with loads of stuff going on, as I've not even tried that yet. This is happening in Boot Camp Basic Training with hardly ANYTHING going on, which is weird. I had this exact same problem with the game 'Fallout 3' and it caused me to uninstall it (smooth gameplay at the start, then all of a sudden it'd completely slow down & my character's responses would become really slow etc). I REALLY don't want to have to uninstall Arma II aswell, as it looks amazing & I'd love to sort this problem out.

I've also taken a picture of my ingame Video Options, so that you can take a look if need be & let me know if I should change anything, although like I said above the game runs smooth as hell with no lag at all during the first 5-10 mins of gameplay, so if it was something to do with the video options ingame, it wouldn't run smooth at all would it?

Video Options Screenshot - http://i30.tinypic.com/28tf2p1.jpg

So if any of you guys are able to help me out, I'd very much appreciate it, thanks in advance!

My computer has had this problem for several months now, I used to be able to run games perfectly now I have the same problem as you. Sadly I don't know how to fix it.

A friend just told me this could be due to having VSync enabled which is causing something called "input lag" whilst playing. If anybody can shed some light on whether this IS the cause or not, that'd be great.

And to ManicAce above, I have nothing overclocked. Everything is running at store speed. Also, the max my GPU temperature has gone to whilst playing Arma II is around 82c. I'm not sure whether this is normal or not really, but I read somewhere that 8800 cards tend to get really hot? I don't know. The inside of my PC is extremely clean anyway as I use a can of compressed air on it every week or so.

Try lowering Antialiasing and see what happens. Cheers

A friend just told me this could be due to having VSync enabled which is causing something called "input lag" whilst playing. If anybody can shed some light on whether this IS the cause or not, that'd be great.

Pumpatron87

[QUOTE="Pumpatron87"]

A friend just told me this could be due to having VSync enabled which is causing something called "input lag" whilst playing. If anybody can shed some light on whether this IS the cause or not, that'd be great.

ManicAce

[QUOTE="ManicAce"][QUOTE="Pumpatron87"]

A friend just told me this could be due to having VSync enabled which is causing something called "input lag" whilst playing. If anybody can shed some light on whether this IS the cause or not, that'd be great.

Pumpatron87

[QUOTE="Pumpatron87"]

A friend just told me this could be due to having VSync enabled which is causing something called "input lag" whilst playing. If anybody can shed some light on whether this IS the cause or not, that'd be great.

ManicAce

well i turned off v-sync on the nvidia control panel and it didn't help sadly. Thanks for the help though. Could it be something else?