Hi. Has anyone played Oblivion for very long hours and suffered some kind of slow/near freeze effects on magic, opening of gates etc?

First time I encountered this problem, my character has been through bout 304 days in the game. Since, I've played with another 4 new characters with same name or other names, only 1 survived without this problem yet. All others are doomed, between 270+ - 300+ days. I loved this game but this bug is spoiling everything. I'm beginning to feel this is the lousiest open-end game. I don't want to feel this way... it's a good game...