IdleMiner is ONLY miner which will not slow down your computer.

IdleMiner uses special algorithm which will suspend your mining process while you work on your computer. Your miner will work only if your computer doesn’t do anything for few seconds. When you move your mouse or tap some letter on your keyboard, Idleminer will suspend whole process (it is very different from other miners cause other miners like Nicehash will kill whole process) but IdleMiner will just continue mining on the section where it has been paused. Following this method you will mine much more and you computer will stay fast cause everytime you kill process (and than start process again) it slows down your computer.