Well the lag didn't last long because I actually had a complete failure after installing 4.0.4. My Xoom went to sleep and would not wake up, had to do a soft reboot and then could not get passed the motorola boot screen, was stuck on it for hours! Tried to go into recovery to wipe and reset but that would not work either. Tried to push a rom image from my pc but then my xoom decided that it didn't want to be detected by my pc anymore so it looked like my xoom was bricked :-(
Luckily I had some help from some great people over at xoom forums who helped me to get it back up and working by using RSD Lite and a stock Rom SBF file.
I now have a working xoom updated to 4.0.4 with no problems at all
Not sure but I think it may have been a freak accident that just happened to me.... I just hope it doesn't happen to anyone else
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