With the same default config on:
NW.JS i get around 7 hashes per seconds (4 threads)
Browser(Firefox): 60 hashes per second. (4 threads)
In both cases the CPU get around 90-95%.
What can be?
Also the best browser to mine is Firefox(61 per second) with last
update. Chrome/Opera/Vivaldi get 55-56 per second. i don't know why.