Problems With Other Add-Ons

Hey!When I have only FS2002 running the PMDG 737-700 seems to work fine, taking into account the known issues.However, when I also run FS Meteo, Flight Tracker and Active AirSource, which I always use for VA flying, then I have serious problems.I have only managed to complete 1 flight out of 5 using my normal setup. When minimizing to look at Meteo or to use the AAS program and then return to FS, the sim slows to a crawl, fps of 2-3. I mean screens freeze, the HD light flashes for up to 2 mins and generally FS becomes unuseable. I then have to exit and reboot.Guys, I know it is a complex aircraft, but I have most of the other popular ones and don't see this with those. So is there any known issue with other add-ons running at the same time? I use FSUIPC 2.95 with FS2002.I even tried setting FS to high priority in the task manager but it seemed to make it worse.Gents, I will have to park this a/c until I can figure out whats happening, any help would be very much appreciated.