(https://i.imgur.com/nkuVD68.png)
The numbers in brackets indicate less than 100% of 4 threads in use. The correct answer should be 82%, by calculating (CPU time / wall time / CPU threads) * 100
I think what you might have done is forget to divide by the CPU threads, which gives 328%, which was then capped at 100%.
OK, do you have a project for me to test?
https://github.com/efmer/boinctasks-js/issues/143
Milkyway @ home is mainly multithreaded.