By checking these transactions, you are helping the network to make the currency more secure. But this mining can slow down your computer. And if someone is mining cryptocurrency on your computer without your permission then this can damage your computer . Cpu mining does not become profitable nowadays.
Does crypto-mining damage your CPU?
Cpu mining does not become profitable nowadays. only few currencies like litecoin and monero supports cpu mining. However please refrain yourself from cpu mining you will not be able to work on anything while mining is on. if your machine is not maintained the required cooling temperature then parts may get damaged .