ofxGui super slow on Raspberry Pi using GLES2 programmable renderer

Noticed this slow down while doing some other work.

You can reproduce this by comparing the standard examples/gui/guiExample app.
Just change the main.cpp to the following:

#ifdef OF_TARGET_OPENGLES
	ofGLESWindowSettings settings;
	settings.glesVersion=2;
#else
	ofGLWindowSettings settings;
	settings.setGLVersion(3,2);
#endif
	ofCreateWindow(settings);

	// this kicks off the running of my app
	// can be OF_WINDOW or OF_FULLSCREEN
	// pass in width and height too:
	ofRunApp(new ofApp());

Change the settings.glesVersion line to toggle between GLES1 and GLES2 to see the performance drop. It goes from 60fps to 9fps when switching between the two render paths.

I also noticed drawing primitives like ofDrawCircle() to be very slow under GLES2.

Start with examples/gui/guiExample and its main.cpp, then reproduce the FPS difference by toggling settings.glesVersion between GLES1 and GLES2 on a Raspberry Pi. Compare the GLES2 rendering path, including primitive drawing such as ofDrawCircle(); done means the severe GLES2 slowdown is resolved and the example no longer drops from about 60fps to 9fps.