Good learning experience to turn this loose for feedback from new users with different computers, browsers, bandwidth etc.
FYI, On my computer, Firefox with IPC off, it runs at 60 FPS.
It's looking like we need to focus on increasing the efficiency of interaction between the GPX data and the Google Earth API so it doesn't choke so often when importing files on different computer set ups. I'll make this a priority. I will speak with our developer and get a better understanding of maximum file size that should import without self destructing. Nothing should take 30 minutes to import.
Ah...the ups and downs of developing web based software.