FPS Drops During Raids

Hi Guys

I have a real problem here and its starting to bug me

Each time i am raiding i get fps drop from 190 to 35 and it stays there until i relog or do a /reload ui

This is getting frustrating since it usually happens in the middle of a boss fight

im running an

Core i7 3770K
Geforce GTX 750 Ti
16 Gig DDr3 1600 mhz Ram
2 TB HHD

I am currently using the old WotLK client since i thought it might have been the HD models doing it, im also running Ultra graphics except for Shadows and Ground Cluttering radius and the other Ground Cluttering both set to low

Addons im using are

DBM
MP Reporter
Skada
Spartan Ui
Bartender 4
Raidcooldowns
X-Perl Unitframes
Omen Threat Meter
OmniCC
Gearscore
Qdkp 2.0
Bagnon
Atlasloot

Some input to this would be much appreciated