What to change first

Compress textures first, then resolution, then geometry. Savings are estimates.

Why the order

Images dominate most architectural GLBs. Compressing them to KTX2/Basis moves both download size and GPU memory. Meshopt/Draco only move the BIN. Material merges move draw calls, not megabytes.

gltf-transform

The advisor prints gltf-transform commands. Run them on a copy, then open the result in the analyzer.

Tools for this task

GLB Optimization Advisor — Suggested changes for a GLB, with estimated size and GPU memory.