I doubt you would notice much a performance hit if any. What you’re losing out on is reliability. You playing games and downloading/executing stuff causes extra processes to run that normally wouldn’t on a server. The more processes running the more chances for a glitch in the matrix to crash the machine. You could also do an update that breaks compatibility with other programs (not so much an issue with Docker). The biggest point of a dedicated sever at home is the fact that you set it then don’t fuck with it - This leads to higher reliability.