What do you call batching exactly ? Concerning performances, there is a benchmark demo that measure time to display the vbo versus time to create/upload/display it. Nicolas
I call batching when you send your vertices to the GPU for rendering (i.e draw calls). Obviously you wanna send as many vertices as you can with as few draw calls as you can. Now in my case I send 6 vertices / draw call (drawing a letter).
I tried out the benchmark demo, and I could see the same performance issue. If you uploaded the text every frame it was like ~80FPS, and if you uploaded only once and drew the whole text with only one draw call, then it was ~500FPSm, which should be the ideal case. But what do you do when you have to display text that changes all the time? So I thought about it, and I realized that it would be ideal to split the rendering to "static" and "dynamic" text. This way one could preserve most of the FPS without the restrictions of either techniques.
.
