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As I recall, the idea was that a "heavyweight job" was the kind that involved a lot of SIMD-type computation. Basically, the kind of work that gets offloaded to a GPU or specialized unit these days. I think they were suggesting that those kinds of jobs did not incur as many branch-miss bubbles but were more likely to experience data-starvation bubbles, which affect both sides of the core at the same time, so the HT does not really solve the problem there.