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HyperThreading enabled will degraded performance under heavy load. It was really made so that when your playing a game, the unused chip time can be doing some ( normal background system task aka light loads ) instead of being idle. 66% = game, 33% = idle to 66% = game, 33% = anything running in the background the problem is if either HyperThread1 has a very heavy load and halts nothing comes out HyperThread2 until that HyperThread1 finshes what it is doing.