Blog/Technical Guides

Technical Guides

Implementation guides, code tutorials, and technical how-tos for cookie consent

Technical GuidesJan 28, 2026

The Performance Tax: How Cookie Consent Scripts Destroy Your Core Web Vitals (With Real Data)

Data-driven analysis of cookie consent performance impact using real-world measurements. Presents benchmarks showing 160%+ page load increases with heavy CMPs, LCP delays of 500ms+, CLS shifts from banner rendering, and INP issues from consent interactions. Compares script sizes across major CMPs (Cookiebot 180KB, OneTrust 300KB+, CookieYes 150KB) against Cookient's 5KB footprint. Explains why synchronous loading is required for true blocking compliance yet destroys performance with bloated scripts. Includes PageSpeed Insights before/after comparisons.

12 min readRead article →
Technical GuidesJan 28, 2026

Why 90% of Cookie Banners Don't Actually Block Tracking (And How to Tell If Yours Is One of Them)

Technical exposé revealing that most cookie consent implementations are 'compliance theater' - showing a banner while tracking continues unabated. Explains why basic script defer/async doesn't work, how Google Tag Manager bypasses naive blocking, and why MutationObserver + type='text/plain' is required for true compliance. Includes step-by-step verification guide using DevTools Network tab to test your own site, plus how Cookient's DOM-level interception ensures scripts never execute before consent.

11 min readRead article →
Technical GuidesJan 28, 2026

The Complete Guide to Google Consent Mode v2: Implementation, Testing, and Troubleshooting

A comprehensive walkthrough of Google Consent Mode v2 implementation, covering the four key parameters (ad_storage, ad_user_data, ad_personalization, analytics_storage), Basic vs Advanced modes, common implementation errors (67% of setups have issues), and how to verify your implementation with Google Tag Assistant. Essential reading for anyone using Google Analytics or Google Ads with EU traffic.

10 min readRead article →