System crash at one end, extremely slow on the other: Using Adobe Connect.

The instructor side is a mac.  I can get more info on that later.  My system is a windows 7 based unit using Firefox 5.0. I will fill that in later but suffice it to say that all software is up to latest versions on both sides.

Using Adobe Connect for an online class, the instructor's Mac computer kept crashing. He could conduct the class for about 10 minutes.  Meanwhile, I saw that when he was connected, my system would slow down to slower than a crawl.  If I were to type in these three lines, it would take 3 - 4 minutes just to show up on the screen. When his system crashed, my system would run fine and, as I was still linked to Connect I could talk and chat with the other students. I have the windows tachometer on the screen and it is pinned while he was on line and scarcely above 10 when he was not.

Does this make any sense?

When I check the task manager, it showed that Plugins_container.exe was taking up the CPU time.  I looked into defeating the Plugin-Container but that didn't help. I changed over to Internet Explorer but that didn't help. I used a newly set up laptop and IE but that didn't help. It could be my fire wall but it only happend when his system is connected.

If anyone has amy insights on any of all this I would sincerely appreciate hearing about it.