Let me preface this by saying that I can't show you what's going on in that the "sluggish-ness" is happening on my company's intranet site. The URL I'm about to direct you to shows the page and it loads fine, so...there you have it.
Here's what I've got: It's a calendar. Head out to http://brucegust.com/portfolio/verizon/index.php?month=5&year=2015
and see what I've got. As you click on the arrows to move from month to month, the page loads up instantaneously. On my work's intranet site, however, the calendar dramatically lurches to the right as it takes a moment to load and the resolves in the center and it's fine. But that first split second reminds me of a drunk stumbing into a room and I've got to figure out what I can do to eliminate the "stumbling."