Massive slowdown

When I play a particularly creature heavy deck (like my colorblind Aeriel Assault Deck, a 217 card monstrosity, black/white deck with almost nothing but fliers- save for 4 Royal Assassins and 4 Sorceress Queens- and supporting artifacts, like The Hive ect). My problem is once you get a lot of creatures in play (especially if the majority are Wasp tokens, and gets even worse if both players are making wasps), the game slows to where pouring cold molasses is quicker. I once waited 5 minuted for an attack by ONE Zephyr Falcon to start (hit the "Attacker fast effect phase") during the Arkazon fight. Had to ctrl+alt+del because nothing was happening. It was irratating for 2 reasons. First, you can't save before fighting Arkazon (so you have to beat the last wizard in his castle, and his minions to GET to him), and in that duel he was down to 38 life. I shouldn't have a problem like that with a computer that runs games like WoW flawlessly. Not a problem with a game that's, what, 17 years old?