i have a js that creates one render object and sketch object with drawing some triangles in opengl. these are scaling up and down over the time. at startup everything works fine but after some minutes the fps going down and down from 50 to 30 and less. the render gets banged after the drawing command. have anybody a suggestion where the problem is? can it be a memory leg, because calculate the new vertex position is done each time the drawing command is called which is metro 50.