Slow https on Vista

[Dave]

Have recently installed a handful of Vista machines running IE7 on network.
Access to http sites works gret but access to https sites takes 15-25 seconds
on average to load. Have tried the "netsh interface tcp set global
autotuninglevel=disabled" option, disabled TLS1.0/enabled SSL2.0, etc. to no
avail. This is happening on internal network SSL sites as well as external
SSL sites. Any suggestions?

Thanks in advance!

Dave

 

[Dave]

On further testing, accessing https site on this Vista box using Firefox
works fine. Still, using IE7 takes 15-25 seconds for page to load. Anyone
know of any IE7/Vista issues that I can try to resolve this?