WebGPU Training Speedup Ranges from 2.6x to 12.1x Depending on Model Size
A WebGPU-based browser training implementation was benchmarked against multithreaded WASM SIMD across four model presets, yielding speedups of 2.6x on Small, 6.8x on Medium, 9.3x on Large, and 12.1x on XL. Loss drift across all presets remained modest, ranging between 1.1% and 2.5%. The gains scaled with model size because larger matrix multiplications made better use of workgroup tiling and register blocking, while dispatch overhead had a greater impact on smaller models. Reporting a single headline speedup number was found to be misleading, as it only captured one point on a broader performance curve. The author argues that accurate reporting should include the preset, baseline, step definition, and loss-parity result alongside each speed measurement to allow reproducible comparisons.
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