Design a Text-to-Image Service

1. Frame the Problem: When One Request Costs Ten GPU-Seconds

"Design Midjourney or DALL-E" earns its place in this module by breaking the one assumption every other lesson so far has quietly leaned on: that a request-response cycle can stay synchronous. (Synchronous means the user's request just waits for the answer inside one open connection.) A diffusion model generates an image by starting from random noise and cleaning it up step by step, over many denoising steps, where each step is a full model pass on a GPU