Slowly I turned.... Why is my Quad Core MacBook Pro getting slower with each Lion update?

I upgraded to Lion on my 20011 15" 2.0GHZ Quad Core MacBook Pro. The machine crashed at least 7 times (reports forwarded). I upgraded to 10.7.1 hoping for the crashes to go away. It began to crashed once a week. On checking the console reports Virus Barrier and Kaspersky (****!) used with Parallels seemed to be causing the crashes.  Turn those puppies off and the crashes disappeared.  HOWEVER, the computer is slow; opening mail seems 50% slower than on my MacBook 13".  Today after spending 3 hours updating to 10.7.2, all apps seems to be dragging.  Any ideas out there?
Michael

OK. Here's some test results. The most intense process I use on my Macs is using Handbrake to encode either DVDs or mkv files to mp4 files which generally pushes all cores to the max. I am using the latest 64bit version of Handbrake on both Macs.
So I took a sample mkv file of 65 seconds length and ran it using the same settings on both the Mac Pro (2 x 3 GHz Dual-Core Intel Xeon 8GB RAM) and the Macbook Pro (2.66 GHz Intel Core i7 4GB RAM), straight after starting up both Macs so that there was plenty of RAM to spare on both. I ran the test two times on each Mac and got similar results both times, with the best results on each machine being as follows:
Mac Pro: max RAM used: 380MB, Time for encode: 102 seconds
Macbook Pro: max RAM used: 495MB, Time for encode: 84 seconds
This was for a 2-pass encoding with Turbo first pass to 2200kbps MP4 file from 720p mkv file.
So the Macbook Pro is coming in considerably quicker for this particular task. I'm not sure why the Mac Pro used less RAM, and whether this is the main factor in the time difference. Like I said, there was plenty of unused RAM on both Macs when I ran the test. I am no expert on the inner workings of Macs!
Needless to say though, I am happy with the results and very happy with the new Macbook Pro.
Nick

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