For other people coming across this -
OF 9 has sorted out the sluggish speed on iPad air 2 (I assume this is because of 64bit architecture)
Also big thing that I found for drawing particles - it seems much more efficient to use pushMatrix() and pullMatrix() to draw offscreen rather than on screen so...
DO -
ofPushMatrix();
ofTranslate(x,y);
ofCircle(0,0);
ofPopMatrix();
DONT
ofCircle(x,y);
Hoping to stop some sore heads Image may be NSFW.
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