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What is the fastest way to render semi-transparent billboards (for a particle system) on iOS? I'm currently using GLES1, but if required for performance I can switch to GLES2.

  • Does sorting the quads prior to rendering matter to performance? (It does not affect what my particle system looks like when rendered.)
  • I render one quad at a time using glLoadMatrixf(cam.inverseMatrix(angle, scale, pos)), how can I speed that up? The particles naturally move individually.
  • Is it faster to use glBindBuffer(GL_ARRAY_BUFFER) and glBindBuffer(GL_ELEMENT_ARRAY_BUFFER), or simply call glDrawElements without binding first as I'm only rendering four vertices at a time?
  • Any other performance tips for rendering particles fast on iOS?
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