Performance issue

Hi,

Lately I've been working (playing around) with this framework to get familiarized with it. In between my tests I found that it cannot handle rendering too many objects at once.

For example I was rendering 400 rectangles and it lagged.

I thought, something's gotta be wrong with my code (it was really messy by that time), so I decided to rewrite a minimal prototype by making a particle system and spawning lots of rectangles, and so it could handle 13k rectangles without lagging approx.

Then I tested loading textures, and I found out that I could still rendering ~13k rectangles + a bunch of textures without lagging ONLY IF, textures where placed after the rectangles in the object container; because if I first rendered the textures, spawning new rectangles lagged the whole scene.

Also, overall rendering was affected by font rendering.

I do not know if what I just described makes sense. I want to find out.

Thanks in advance!

Start by reproducing the reported comparison: many rectangles, textures placed before or after rectangles, and font rendering. Use the minimal particle-system example described in the issue as the baseline, then identify whether the rendering slowdown still occurs and document a concrete cause or narrowed-down reproduction.