@OP, maybe you can tell us anything about your device's specs? Such as your CPU, RAM, and VCard. Because based on my understanding, running an auto-bet on a background esp in a browser would eat huge capacity in your processing units.
here's my device's specs:
- Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
- 16 GiB RAM
- GM108M [GeForce 920MX]
That's a pretty good specification but I don't think those gambling site are using your CPU for mining, if you still doubt about it then don't use their auto-bet program and just enjoy betting on your own. Try to clean up everything on your computer, and check if your CPU is still good there might be wrong here but I don't conclude that those Gambling site are using your own CPU, I just can't imagine how this thing works, and auto-bet can't consume that much.