CPU issues when adding effects

Hi,
Can anyone help with adding effects to my tracks on Adobe Audtion 3. After adding a few effects I get an error msg saying not enough CPU on my computer to use this effect. It also causes crackling once I have added more than a few effects. I also am finding it hard to understand why my recordings seem to save some many .wav files.
Regards,
Ian.

After adding a few effects

Which effects?  Some are more cpu intensive than others and you may want to try sending effects to a bus to reduce the instances of those effects

What CPU etc is it?

It also causes crackling once I have added more than a few effects

Probably CPU and possibly hard disk speed related

I also am finding it hard to understand why my recordings seem to save some many .wav files

AA3 sends everything direct to disk in multiview (trust me this is a positive thing as is all those files)

But you may want to check out MediaSweeper to sort out your excess or unused files.
www.mediasweeper.com.au or http://www.suitespotstudios.com/MediaSweeper.htm

thank you all for the suggested fixes. The message I get is: the plug in was unable to load, CPU load limit exceeded. I am using VST/UAD effect, mainly compression and reverb. My PC is brand new and when I check the system performance it is only using less than 20per cent?
thanks Ian.

My PC is brand new

What are the specs? CPU, RAM etc

I am using VST/UAD effect, mainly compression and reverb

Are thes internal AA effects or plugins - if so which ones are they?

when I check the system performance it is only using less than 20per cent

Are You using Process Explorer to do that?