I'm running ZISS on Win XP Pro. When the anti-virus/spy ware scans start, they typically take over 90% of the CPU, which brings everything to a crawl. The obvious problem is that scanning is very CPU intensive, and there is no limiting in the scan process. I also run a virtual machine all day, and it also has ZISS running. Same thing, except both the VM and the PC are brought to a crawl. However, if it set the VM process priority to below normal, the PC functions normally, while the scan running in the VM still consume substantial CPU.
Therefore, I suggest that the scan processes be launched with below normal priority. When nothing else is going on, they will continue to run at over 90% CPU. However, they will stop bringing everything else to a crawl. I can't imagine this is a very difficult change...
Operating System:Windows XP Pro
Product Name:ZoneAlarm Internet Security Suite