There are instances when the same request for data from a replica set takes a lot longer than usual. The difference is from milliseconds to 20-50 seconds. Its is the same request, but at times takes a lot longer to fulfill. What would be some of the causes of this, memory, disk, network etc? Our replica set is on a virtual Windows Server 2008 R2. We have a primary, a secondary and an arbiter. Each have the same spec of server with 8GB of RAM.