If the network is under a heavy load, and it does not give adequate CPU time to process system-level tasks such as handling routing protocols, configure the scheduler command to allocate CPU times efficiently. Configure R8 with scheduler allocate 2000 500.
For more info on the scheduler command, see the following URL:
Configure service nagle on R8.
For more info on service nagle, see
Configure HTTP server on R1 with AAA authentication and Exec authorization ...