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vSphere Initial Sync Stalling for replication.

Before our initial sync for replicating a VM was happening in couple of hours. Now initial syncs are taking like 20 hours. Does anyone know why the initial syncs are "hanging" now?
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Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
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Is this a single VM, or multiple VMs?
what are the VMs, and is data changing alot on the VM which is being replicated?

e.g. email server, bsuy SQL server, File Server
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They're SQL servers. I did like 2 VMs, waited 2 hours, did 2 more VMs, waited 2 hours, did 1 VM... 20 hours later 4 out of 5 of those VMs are still doing their initial sync. Before it was only taking like 2 hours.
Are more than 1 VM syncing at the same time now?
Yeah 3 out of those original 5 are still doing their initial sync and 20 hours have gone by.
Could be your datastore and/or LAN/WAN are the bottleneck!

Check a single VM versus multiple VM replication, to confirm.
Are you keeping snapshots?  Multiple snapshots means longer time for replication.
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1) Are you using the vSphere Replication 5.1 appliance or SRM? Please include build numbers.
2) What type of storage are you using in both sites?
3) Are you replicating VM's to a different physical location? iF so what is your WAN bandwidth?
4) On your source host have you used esxtop to check the servers disk, and network stats? check the DAVG and KAVG.
5) Have you tried to replicate a test VM from your remote site to your main site to see if replication is still slow.
6) In VMware how is your Networking configured?
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This make sense for an active DB server..

Thanks for the update.