ISA Server and slow SSL

Over the last 4 months I’ve been attempting to track down and solve a problem with ISA Server and an SSL web service we were using. Initial access to the site was fine, but about 3 or 4 pages in, access would become painfully slow and page elements or entire pages would fail to load. This problem was most evident in Internet Explorer, but would also appear in Firefox. It was also most visible on this one particular web service we use, but at times showed up on many other SSL-enabled sites. Last Monday I finally figured out what was happening and solved the problem. It was right in my face the whole time.
Continue reading