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When I'm playing a game sometimes the game speed changes. This happens fairly often. As in, I'll be running the game at a normal speed, then it might slow down to half speed for a bit, then it might go to a higher than normal speed.

Is there some way to prevent this?

CPU: Intel Sandy Bridge i5 quadcore 3.0 ghz
Ram: DDr3 8gb
Graphics Card: NVIDIA GeForce GTX 550 Ti
OS: Windows 7

I'm running PCSX2 version 1.2.1

I've been running default setting, I have fiddled with them with no success.

I've mainly been playing Rachet and Clank 2(Which lags) and Dynasty Warriors 5(which doesn't lag very much) Both from ISO

In order to help you further with your problem, please make sure the following are all provided.

• Your hardware specs - CPU, Graphics Card, Memory, Operating System.
  
• The version of PCSX2 you are using.
  
• Any non default settings you are using.
  
• What games you are trying to play and if you are playing them from ISO or DVD.
  

Thank You.

For a start, make sure you haven't bound any controls to Tab or F4, since the former is used for turbo/slowmo toggle and the latter for frame limiter toggle.

does it happen while you/the screen is standing still or when you move around and thousands of npc's appear?

What are your GS%/EE% readings in the title bar in window-mdoe?

This is probably a desktop or are you using a notebook?

Can you maybe provide the number of the i5? Just to be sure that 3.0 GHz is not the turbo-boost limit.

So far you don't use any speedhacks?