ezejmnap.exe is component of the ThinkPad EasyEject Utility. It manages the devices connected to your ThinkPad and makes it easier to disconnect multiple devices from your system.
It is not an essential process but is obviously required for the proper functioning of ThinkPad products.
Non-system processes like ezejmnap.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues