First I would like to thank the 3 players who taught me how the dragonstar hard mode works. We manage to get to the final boss without deaths, I believe.
Anyway, on the final boss (and this have happened before on normal mode), about 2 min in the fight, my FPS dropped to 7, and stayed there. When I respawned (loading) it was fine again. After this happened 3 times, I adjusted the graphics down to medium, and deactivated ALL addons. It happened again, but this time, it went down to "only" 11 FPS.
Really embarrassing as I didn't had a working microphone, and couldn't tell them what happened during the fight

.
This is one of the reasons I have to go to bed without the achievement.
Is this my computer, or have anyone else had the same experience?
PC, EU server, Ebonheart Pact
Finally a reason not to play League of Legends