Server-side rendering quietly converts a static site into a live application. The mental model rarely follows. Teams keep treating an AWS Amplify deployment as static hosting, which is famously reliable, while every page view now depends on compute that calls APIs and can stall.

A slow API behind a single component doesn't degrade one widget. It delays the entire rendered response. Visitors see a blank page rather than a partially working one, and search crawlers see a timeout. One misbehaving data source looks exactly like the whole site being down.

Gremlin reaches the render path with Failure Flags. Inject latency into a data fetch and watch what your visitors get. Inject an error and confirm whether your fallback renders cached content, a degraded view, or nothing at all.

Serving something imperfect beats making a visitor wait, but only if someone has verified the fallback actually triggers.