Just getting back from work but just noticed running this that it puts a serious hit on my R9 280X.

While mining on the 280X I usually get about 670 kh/s at 96-99% gpu load. When I run this miner it drops to about 470 kh/s at 80% gpu load. I can stop the twe miner and it goes back to normal. Start the twe miner and it lowers again.

Is there a reason for this?