[kllrnohj]

> Drawing things that won't change every frame into textures (not shaders), and then compositing those textures together on every frame, is by far the most efficient approach today, on all platforms

Not really true. It's a lot more efficient to draw quite a few things from scratch than it is to use a cache texture. Texture composition requires a lot of memory bandwidth, which tends to be a rather constrained resource. It is very effective to do things like put each window in its own texture, yes. Within a given window using caching textures tends to be a net-loss, though.