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Thanks for the reply.

If I try running a browser with the miner on win 7 hash rate drops off a by probably 25% but at a max, I'm only getting something like 1.7 MH/s anyway.

Setting the priority to low didn't help speed up other processes for me so I disabled one of the cores and it helped.

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Looks like you have an old CPU, 1.7MH/s with 4 cores is pretty low, maybe that's why it's rushing that much. I have my Windows on an i5-9400F and it's on average around 6MH/s with all 6 cores (Low priority too).

Yep you're right, my laptop is old enough with i5-5200U processor. Probably better to buy koin than mine for me anyway

Yes I think it's the best solution, there are some huge miners scooping most of the coins, hard to compete with them when we're doing a few MH/s while they're doing GH/s!

I've noticed in Windows that reduces it by about 50%

It depends, if you have other processes using a lot of CPU then yes the hashrate will decrease. But if you're not doing heavy activities, your cores should all be at 100% even with low priority.