[tryp4vps]

..... the solution of that is probably tell the visitor that it is mining and have the option to opt out . so there is an option for lower end slow potato pc user

I do agree that allowing visitors to have an option to opt out should be the minimum requirement.

Another way, which I believe it is a better way, is to set opt-out as the default. So only visitors who opt-in will actually have the mining script running in their PC.