Autoptimize vs Speculative Loading
Compare WordPress plugins and tools side by side. Pick products with “Compare” in the software directory.
| Feature | Autoptimize v3.1.16 · checked 23 Oct 2026 Free + paid · ★ 4.7/5 Visit Details | Speculative Loading v1.7.0 · checked 23 Oct 2026 Free · ★ 5.0/5 Visit Details |
|---|---|---|
| At a glance | ||
| Active installs | 800,000+ | 70,000+ |
| Last updated | September 26, 2026 | August 26, 2026 |
| Editions | Autoptimize · Autoptimize Pro ($) | Speculative Loading |
| Pros | Aggregates and minifies CSS and JavaScript; Lazy-loads images with WebP and AVIF support; Works without changing theme code | Near-instant page changes for visitors; Settings under Settings > Reading; Maintained by the WordPress Performance Team |
| Cons | Aggressive script changes can break pages and need testing; Page cache, CDN and critical CSS need the paid Pro version | Prerendering loads pages before the click, so page scripts may run early; Behaviour depends on browser support for the Speculation Rules API |
| More features | ||
| Other features | CSS and JavaScript aggregation and minification, Image lazy-load and WebP and AVIF settings, Extra options for fonts, emoji and script placement, Critical CSS through the criticalcss.com premium API ($), Pro upgrade tab in the admin | Speculation rules printed in the footer, Prefetch or prerender mode and eagerness settings, Exclude paths from speculation |
| Integrations | ||
| Other | criticalcss.com ($), Google Fonts | — |
| Requires WordPress | 5.3 | 6.9 |
| Requires PHP | 7.4 | 7.4 |
| Tested up to | 7.1 | 7.1 |
| Phones home | No | No |
| External services | criticalcss.com, misc.optimizingmatters.com | — |