Under optimal conditions (rendering) enabling SMT on Intel gives just ~30% extra performance, ~40% on AMD (usually much less), so of course you can't compare th

Under optimal conditions (rendering) enabling SMT on Intel gives just ~30% extra performance, ~40% on AMD (usually much less), so of course you can't compare the additional thread provided by SMT to a thread running on another, otherwise idle core. Scheduling only threads of the same process on a SMT group at a time is the easiest portsmash mitigation while still retaining some of the SMT peformance benefit.