Direct ptychography performance targets

Microscopists steer aberration controls while viewing the same full bright-field reconstruction used for the final result. For native full-resolution live display the targets are:

• 512x512: at least 30 FPS (<=33.3 ms/redraw).

• 1024x1024: at least 10 FPS (<=100 ms/redraw).

Do not claim these numbers from detector binning, scan cropping, fewer BF pixels, or saved complex64 caches. Those are separate preview/export choices.

Current behaviour and measurements: direct ptychography fit methods, the kernel registry, the verified results and the dated direct ptychography reports. The measured log of the CUDA, MPS, native Metal and WebGPU direct ptychography work up to 2026-10-18, including the rejected layouts and kernels, is archived in direct ptychography performance history; its numbers describe retired code and are not current.