dl2mpapisms.dll is a DataLayer 2.0 SMS MPAPI Plugin
belonging to DL2MPAPISMS Module
Non-system processes like dl2mpapisms.dll 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.