sidesearch1311.dll is a Lycos Sidesearch Client
belonging to Lycos Sidesearch Client
from Lycos, Inc.
Non-system processes like sidesearch1311.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.