After upgrading to Tiger I noticed some anti-improvements in my powerbook which to some extent, have been fixed by 10.4.2. With Panther my pbook was asleep about 1 second after closing the lid, but with Tiger that grew to about 8 seconds, but now it is back to 1 after this update. Tiger also made the laptop MUCH slower connecting to external displays and especially when changing between mirroring modes. I would press the F7 mirroring key and often wait about 20 seconds with Tiger for it to change, but have not tested again after this update.
