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in the terminal you can use the ps command to see the running processes personally I use 'ps aux | grep program' however this will likely return the ps command will likely return the grep process itself what can be ignored. Games will not be running by default but other processes or applications might possibly be if you are looking into other things.
They could slow the system by taking up filesystem space in a way that results in greater and wider scattering of files for packages that later get upgraded. Backups would run slower if you backup the system. Other programs that look around for files would take more time.