Burning Crusade FPS in TBC is lower than in WOTLK

[NuperSatural]

I have a gtx 780, an i7 and 16 gigs of ram. I get like 80 fps in stormwind on Outland, even if i put everything to low i get no more than 100. Any way to fix this? My fps on Lordaeron is fine though

[IcarNS]

The client 2.4.3 is less optimized than the 3.3.5a. You will not get major FPS changes tweaking anything.