Not really sure if they are using CPU mining, but I want everybody to read this, Top sites infiltrated with credit card skimmers and crypto miners.

For the two sites you mentioned, but maybe it has something to do with your autobet.

There was one crash game that I played many months ago that also affected the performance of my CPU and my laptop was getting hot. I call their attention, but nothing come out of the investigation. So I completely stay away from that game and my machine comes to normal again. I've played with wolf.bet before but not really sure if I experience any CPU draining.