I have the following Replica Set

Server/Member 1 - Primary
Server/Member 2 - Secondary (can become primary)
Server/Member 3 - Secondary (cannot become primary, just using for backup purposes)
Arbiter 1 - not in Replica Set, I just use it sometimes when I need to remove one of the members from the replica set

After my primary member crashed (bug reported: SERVER-22617), I needed to shutdown member 3 to copy all files and restore my primary server without an initial sync (the oplog window wasn't enough, the server stood down for 12h+).

I followed this steps:

• remove member 1 from replica set (member 2 was the primary server for the past 12 hours)
• add arbiter 1 to the replica set
• shutdown member 3

After 1 or 2 minutes, my primary server became REALLY slow, I started member 3 and it didn't fix the slowness. I waited for 5 minutes after starting the member 3 to the replica to check if it was going to become normal again, but only after restarting the service (member 2 - primary) it fixed the slowness.

If you need any logs or information, I'll be happy to upload it for you, if possible on a private location