A Cisco VPN Client (5.x) on a Windows 7 system began to exhibit slow loading behavior. Slow in a sense of 2-3 minutes to load the interface to connect the VPN endpoint. I noticed the status window indicated it was loading the cert store.
Investigating further, I determined the slowness was due to the Personal cert store having a lot of certificates. These were created by the Fiddler tool. In this particular case there are 290 certificates in the Personal store.
Removing these certs created by Fiddler while visiting SSL enabled sites has resolved this problem.