Why is the grain filter so slow?

The "Add Grain" filter performs so poorly that I'm wondering if it was written in the 90s and never touched again. On a very short composition with a few other adjustment layers, doing a RAM preview takes about 20 seconds. If I enable the adjustment layer that has the grain filter, each frame takes like 3 or 4 seconds and the whole composition takes about 3 minutes to render. This is on an i7 3930k with 32 GB of RAM which flies on anything else. Looking at the task manager, when it's rendering it doesn't even get to 10% CPU, so I'm guessing it's a very poorly coded filter, unless it's using only the GPU, but when anything uses the GPU I can feel its fan revving up, and it's not the case here. This is with CS6 by the way.

How hard can it be to optimize the same filter to utilize all the CPU power, or at least most of it?
It would take a complete rewriting of the underlying operation of AE. AE processes a pixel at a time and performs mathematical calculations on each pixel in the frame and combines those calculations with each pixel in the frame of the next layer. It does this a frame at a time.
If you have a 2K frame with 10 layers then that's 20K of data that needs to be processed. If it's temporal effects that are looking a frame a head and a frame back then you're stuck with 20 K of data calculations a frame at a time added to the additional 20 K of data from the next or last frame. That's not very much work for 16 CPU's to do. It's why AE doesn't run at 100% when some 3D apps can. Totally different math threads.
The third party solutions for grain that work better still have these limitations, but they have just come up with faster or better ways to make the same calculations that are more efficient.
Asking AE to use 100% of the processor power and 100% of the memory is like asking a 10 inch water main to stay completely full when you've only got a gallon of water in the system and you can only access it through a 1/2 inch pipe.
I'm not making excuses, just trying to explain how AE works. Can Adobe make it better? Sure, for the most part they have with every release that I"ve used in the last 20 years. If you have a good knowledge of how AE processes the pixels then it will help you make workflow and production decisions that make your work more efficient and profitable. It's all part of being a pro.
BTW, Flame, Inferno, all of the other big compositing apps have the same limitation. Only when rendering something more than pixel math does the system start to max out... Try AE with a particle system like Particular and 20,000,000 particles and you'll see CPU and Memory use go up.

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