Timeline
- 2010 „Front-End Performance Optimizing“ — talk The slides that gave FEPO its name. View on SlideShare
- 2010 cookielessdomain.com — cookieless asset delivery, offered as a service Archived 2010–2021. See it in the Wayback Machine
- 2011 w3cvalidco.de — blog on front-end performance optimizing This domain. Online since 2011.
- 2012 responsivedesigntest.net — responsive design checker Built and run until the domain changed hands.
- 2014
–26 Contractor work for an American fintech company Built every HTML page and HTML email, from PSD to production. ASP to Node/AWS migration, Content-Security-Policy hand-rolled in production, Subresource Integrity, knowledge-based authentication and OTP flows. - 2026 fepo.app — Performance Optimization as a Service Audit plus the optimised files, ready to deploy. fepo.app
2010 → today
The 2010 slides listed nine steps of the optimising process. Every one of them is an engine in fepo.app today — written down first, automated sixteen years later.
| Slide, 2010 | Engine, today |
|---|---|
| Remove unused CSS | CSS engine |
| Minify combined CSS / JavaScript | CSS & script engines |
| Use CSS sprites | SVG sprite engine |
| Optimize image file size | Image engine (AVIF / WebP) |
| Avoid HTML errors (W3C validation) | Validation engine |
| Optimize the order of styles and scripts | Head engine |
| Compression, browser caching, Vary header | Compression engine |
2011: cookieless asset delivery, offered as a service. Nobody booked it.
2026: every CDN does it — and „cookieless“ is a privacy argument.
Today
fepo.app — audits that hand you the optimised files instead of a to-do list: subsetted fonts, cleaned CSS, converted images, SVG sprites.
Three free tools, no account needed:
- dsgvochecker.de — GDPR & cookie scan
- cspgenerator.net — CSP generator
- aivisibilitycheck.net — AI crawler visibility
Elsewhere
Ranked 2nd in Germany’s Top 4 Page Speed Experts — NEOSEO, March 2026.