PencilSheep runs all performance-critical operations (layer blending, filters, paint tools, etc.) on the GPU. Filters can be updated in real-time and for many tasks, PencilSheep is orders of magnitude faster than other image editors.
Unlike other image editors (which either don't use GPU computing at all, or only offer partial GPU acceleration), PencilSheep has been specifically designed from the ground up to fully utilize the GPU for all image operations.
Full GPU acceleration is the key technology behind PencilSheep's unique Interactive Filter Layers.