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Disabling hyper-threading is highly unlikely to produce a 30% performance hit. Most highly optimized software disables or avoids hyper-threading because doing so increases performance.

Hyper-threading tends to benefit the performance of applications that have not been optimized, and therefore presumably are also not particularly performance sensitive in any case.

In highly-parallel workloads like rendering (ray tracing) where pipeline stalls due to loads happen quite regularly, it's fairly easy to get 20-35% speedups with HT.

In music production and C++ code compilation I get a pretty reliable +25% perf boost with HT on (this was not the case a few gens ago though).

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