Look at the chart again though. No test is ran with 4 core / 8 threads.
2 vms, one assigned strictly to 'HT cores', one assigned to 'real cores'. So vm a is assigned 4 threads, vm b is assigned 4 cores.
7zip with vm A, then 7zip with vm B. Then both are benchmarked at the same time. He never runs the benchmark while NOT in a vm.
Load balancing is why they run better when not ran at the same times. When the benchmark is ran, there are less resources to share between physical/logical cores. When ran at different times, the difference between logical and physical vms is not noticeable. When ran at the same time, the physical cores have less resources to give the logical cores, and you see lower throughput.
ln2_cooled_heart got a reaction from Chumlee101 in The Workshop Hyperthreading - Confusion