The Results
We ran Google Lighthouse on cmssy.com - our own marketing site, built entirely on the Cmssy platform. The results speak for themselves:
- Accessibility: 100/100
- Best Practices: 100/100
- SEO: 100/100
- TTFB: 64ms
- Total page weight: 332KB
How Cmssy Achieves This Automatically
The key word here is automatically. You don't configure preloads, defer scripts, or optimize rendering manually. The platform does it for you.
Server-Side Rendering for Every Block
Every custom block is server-rendered using isolated V8 worker threads. Pages are fully rendered HTML before JavaScript even loads - ready for search engine crawlers from the first byte.
Automatic CSS Optimization
Blocks use Tailwind CSS v4, and Cmssy deduplicates styles across all blocks on a page. Instead of loading 30 separate stylesheets (one per block), the platform merges them into a single optimized bundle. Today we measured: 5 style tags, 167KB total - down from 36 tags and 4.5MB before optimization.
Structured Data Out of the Box
JSON-LD structured data is generated automatically for every page. Sitemaps, meta tags, Open Graph tags - all built into the platform. No plugins, no configuration.
Security Headers by Default
Every Cmssy site ships with Content Security Policy, CORS headers, referrer policy, and permissions policy. These contribute directly to the Best Practices score.
Font & Resource Preloading
Critical fonts and CSS are preloaded with correct priority hints. The platform handles preload, preconnect, and resource prioritization automatically.
Why This Matters
Most page builders sacrifice performance for flexibility. You get a drag-and-drop editor, but your Lighthouse score drops to 60-70. With Cmssy, you get both: visual editing with AI assistance AND perfect technical scores.
The difference? Cmssy was built from day one with performance as a core constraint, not an afterthought. Server-side rendering, CSS deduplication, and structured data aren't plugins - they're part of the architecture.
Try It Yourself
Sign up at cmssy.com, build a page with the drag-and-drop editor or just tell Claude what you want via MCP, and run Lighthouse on the result. No optimization needed.