How ProRank gets Mobile 95
A 7-stage optimization pipeline that handles SWR caching, CSS extraction, unused CSS removal, self-healing script delay, and LCP optimization. No separate performance plugin needed.
Tested Feb 2026 on Hetzner dedicated server with WordPress 6.9.1, Elementor Pro, 27 active plugins, 3 themes.
What ProRank replaces
One performance engine instead of stacking separate plugins that conflict with each other.
Core Web Vitals dashboard with data source health monitoring
The optimization pipeline
Each stage runs in order during a single page request.
Page Cache
Full-page HTML caching with Brotli compression and stale-while-revalidate delivery. Cached pages can be served instantly while ProRank refreshes expired copies in the background.
- Stale-while-revalidate serves stale HTML while a background refresh runs
- Atomic revalidation locks prevent cache stampedes during traffic spikes
- HTTP/3 and Early Hints (103) for critical resource preloading
- Smart invalidation on post save, status change, and theme switch
- Edge network support for Cloudflare, Fastly, BunnyCDN
- Respects logged-in users, non-GET requests, and dynamic pages
CSS Optimization
Minifies, combines, and rewrites CSS paths. Flattens @import chains and locally caches external stylesheets to eliminate render-blocking third-party requests.
- CSS minification with path rewriting for relocated files
- @import flattening eliminates cascading HTTP requests
- External stylesheet caching (Google Fonts, CDN CSS) served locally
- Combined CSS never loads async to prevent CLS flashes
Critical CSS Extraction
Cloud-based headless Chrome renders your pages and extracts only the CSS needed for the visible viewport. Inlined in <head> so above-the-fold content paints instantly.
- Headless Chrome on our cloud extracts above-fold CSS per page template
- Smart var() reference tracking keeps only used CSS custom properties
- Container query and modern CSS support (2025-compliant)
- Up to 70KB inline budget per page, rest loads async
Unused CSS Removal
Headless Chrome scans your pages and strips CSS rules that are never used. Typically removes 30-50% of your total CSS payload.
- Cloud analysis via headless Chrome, not regex-based stripping
- Subject-only selector matching prevents false-positive removal
- Intelligent safelist for JS-toggled classes (.is-*, .has-*, .active)
- Background queue processing via WP-Cron every 15 minutes
Self-Healing Script Delay
Delays non-critical JavaScript until user interaction, then learns which scripts are unsafe to defer or delay and protects them automatically on future renders.
- JavaScript learning watches same-origin breakage signals from optimised pages
- Repeatedly unsafe scripts are auto-protected and surfaced in the admin
- DOMDocument-based parsing handles WP 6.9 tag concatenation correctly
- jQuery facade captures pre-jQuery calls during delay period
- WP namespace shim prevents broken wp.i18n translations
- Separate handling for trackers (GTM, GA4, Pixel) with configurable delay
- 10-second execution timeout matches industry standard
LCP Optimizer
Automatically detects your Largest Contentful Paint element using PerformanceObserver, then adds fetchpriority="high" and responsive preload hints.
- Client-side LCP detection via PerformanceObserver API
- Learning system remembers LCP per page template
- Adds fetchpriority="high" and <link rel="preload"> with srcset
- Removes lazy loading from above-fold images automatically
- Viewport-aware mobile overrides for background LCP images
Script Manager
Per-script rules to delay, defer, or remove individual JavaScript files. Fine-grained control with QuickExclusions and learning-based protection for page builder dependencies.
- Per-handle delay/defer/remove rules with admin UI
- QuickExclusions and learned exclusions prevent breaking Elementor/Divi dependency chains
- Script discovery mode collects handles for easy rule creation
- Integrates with Critical CSS preload to avoid stale entries
How ProRank compares
Average mobile PageSpeed across Astra, Hello Elementor, and GeneratePress.
Try the performance engine
Page caching, CSS optimization, critical CSS, unused CSS removal, script delay, LCP optimization, and script manager — all built into one plugin.