Ctrl+F during Terror and BW fight to turn off players and their skill effects. Be careful of players of another faction may sneak on you, though.
Turn down your graphic setting to lowest setting for a while. It's a channel-wide raid. Having pretty graphic but lagging so bad won't help you get the loot.
For BW fight, if you are a ranged class, you have better chance to survive and get the loot. Just wait for a roar done, run in DPS, and back off after 15-18s (depend on how late you are after the roar is done), run away to avoid the roar. Rinse and repeat.