Image and Asset Optimization Across CDNs
Synopsis This chapter describes how image and asset optimization works in a multi-CDN environment. It explains deterministic transform URLs, format negotiation with Accept and client hints, parity across vendor image engines, cache identity and validation, quality targets, rollout controls, and telemetry that proves user visible improvements without fragmenting caches or breaking links. Scope and objectives Many CDNs provide on the fly transforms for images and lightweight assets. Typical operations include resize, crop, format conversion, quality selection, and color space handling. Multi-CDN adds a requirement that identical requests produce identical bytes or at least identical perceptual quality, and that cache identity does not drift between providers. The objective is predictable output, stable cache behavior, and measurable gains in transfer size and rendering time. ...