Drawing to an offscreen buffer

[Dutch112]

Don't mess with such low level solutions. Instead turn on caching for your items - it will result in a performance boost which will probably be even better than using a framebuffer.

I already use ItemCoordinateCache for all of my items.

The problem is the animations are sucking a lot of CPU.

To give you an idea of the application, it has 36 rotating images at 25 frames per second along with other static widgets and buttons.

My target hardware is a 1 GHZ netbook with a via unichrome graphics chip.

The above uses 90+% CPU.

I can run Qt's framebufferobject2 example, texturing the quads with the same image used above and rotating them in the same way at 50 frames per second. And this uses only 15% or so CPU.

That is the kind of gain I am looking for and the reason I thought getting frame buffers enabled would improve performance.