Ryzen 1600x 3950mhz/ DDR4 2933 Cl16-18-18-36-50
Vivaldi / Opera => 1.61Kh/s
FireFox 57 ==> 6.16Kh/s
Microsoft Edge ==> not supported.
Huge difference between Opera and Firefox! Did you tried with Chrome?
Chrome == >6.25 Kh/s
Weird....Opera and Vivaldi , both are based on Chrome Engine.