Another news: due to a lot of requests I got, finally I reconsidered my plans about Linux version, I will release it in a couple of days.
Question. Why running your xmr CPU miner affects the performance of your zcash miner? Not enough physical memory? What do you think? The GPU miner uses only about 2% of cpu
Set the xmr process to low priority, and zcash to above normal. ZCash doesn't need a lot of CPU, but if it has to fight for it, it will slow it down.
And if changing priorities like xeridea said does not help enough, use less threads for xmr. -1 at a time until it does not affect zec.
You may also set affinity on both that zec has a dedicated core and rest of them are for xmr