Looks like a bunch of my former teammates have been doing great work to enable Stable Diffusion to synthesize images in ~15s on an Android device:

In a demo video, Qualcomm shows version 1.5 of Stable Diffusion generating a 512 x 512 pixel image in under 15 seconds. Although Qualcomm doesn’t say what the phone is, it does say it’s powered by its flagship Snapdragon 8 Gen 2 chipset (which launched last November and has an AI-centric Hexagon processor). The company’s engineers also did all sorts of custom optimizations on the software side to get Stable Diffusion running optimally.