Lags in icecrown while killing rares

Hello Blizzard,
Dear blizzard i don’t know how you prepare to new expansion but when i see how look killing rare in Icecrown i really fear about new expansion.
Maybe You don’t know but when rare spawn there is one big lag unable to do anything lag is almost few secounds.
If You respect people who play this game and still got good developers please sort it ASAP or we got in new expansion one big amazing lag.

Ps. The best example is Skadi the Ruthless.

Best Regards
Fragie@Shadowsong