Frame Rate Issues, any help?

I created a small mission with models and textures I created myself. The fps were fine, running great. I then sent it off to be worked on by the programming team, and when I got it back it was running at around 1 fps, no joke. I thought it was a problem with my computer, but I loaded up the version I had before the changes were made and it still ran fine. When I asked the program lead, they told me it wasn't them because all they added were GUI elements that pop up when triggers are activated.

Any ideas on what it could be?

Thanks.