As a former VFX freelancer I think many people underestimate how effective cheap tricks like using image textures like that can be. You don't need real noise,

As a former VFX freelancer I think many people underestimate how effective cheap tricks like using image textures like that can be. You don't need real noise, it is enough to have a single texture that is a bit bigger than the input image and then randomly offset and rotate it. If that random offset is random enough (so not pseudorandom with a low periodicity), nobody will ever notice. Memory has gotten cheaper while latency deadlines are still deciding over how much you can do realtime. That means cheap tricks like this are not an embarrassing workaround, but sometimes the smart choice.