Using more than one QGLWidget?

[Paulpro]

I'm having trouble getting two or more QGLWidgets to work. Any I make after the first one the rest run really slow, but the first one still runs at full speed.

I am trying to create a histogram matching program for a university assignment. We need to add extra features beyond the matching for an A. I'm attempting to add visualizations of the histograms.

I attached all my code. It's pretty short mostly just UI stuff and even that is mostly using forms. I'm hoping someone can give me a suggestion, so I can have 8 widgets working at the same speed as each other.OLDRIDGE_A2.zip

Thanks a lot for any help you can give me!!

Edit: I should mention that it is actually the subclass of QGLWidget called HistogramEditor that I am trying to make multiple instances of