Blueprint for Sub-Second Loading Shopify Custom Themes
How we code lightweight custom Liquid templates and control third-party app scripts to hit 90+ Lighthouse targets.
Read article →The architecture merchants edit today is theme blocks: reusable Liquid files in /blocks that can nest, accept app blocks, and be generated by Sidekick.
Three block types
- Theme blocks — own files in
/blocks, reusable across sections. - Section blocks — defined inside one section schema.
- App blocks — provided by installed apps (
@app).
A theme can hold at most 300 theme blocks. To accept Sidekick output, a section schema must include @theme. Shopify wraps generated blocks in _blocks.liquid.
Sources: Blocks overview, AI generated theme blocks.
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