Flying Scripts: Delay JavaScript to Improve Site Speed & Performance

83 Quality Score

Active Installs

20/30

At 30,000 active installs it is a mid-tier plugin rather than a household name, but the score is boosted because installs outpace what is typical for this niche.

Update Freshness

25/25

Last updated in May 2026 against WordPress 7.0, which indicates an actively maintained codebase rather than abandoned software.

User Rating

15/15

A perfect 100 from 38 ratings is encouraging but the sample size is small, so the rating carries less statistical weight than plugins with hundreds of reviews.

Support Health

8/15

With 1 support thread and 0 resolved, the support track record is essentially unproven and that 50 score reflects thin evidence rather than poor service.

WP Compatibility

15/15

Tested with WordPress 7.0 and requiring only PHP 5.6 and WordPress 4.5, the compatibility range is very wide and unlikely to break sites.

Scores higher than 89% of indexed plugins

About

Delay JavaScript to improve speed and performance by loading scripts only when needed, reducing render-blocking for a faster and smoother user experie …

Active Installs 30k+

Rating ★★★★★ 5/5

Last Updated 2026-05-20 11:01am GMT

Requires WordPress 4.5+

Tested Up To 7.0.4

Requires PHP 5.6+

✓ No known vulnerabilities

What It Does

Flying Scripts delays the loading of specified JavaScript files until user interaction (such as scroll, click, or mouse movement) occurs, which removes those scripts from the initial render-blocking path. The plugin works by letting you list script handles or keyword patterns that should be held back, after which they fetch on-demand in the background. This is a targeted performance tactic aimed at improving Largest Contentful Paint and Time to Interactive scores.

Who It's For

This plugin is a good fit for site owners running Core Web Vitals audits and finding that third-party scripts (analytics, chat widgets, ad tags, tag managers) are dragging down their PageSpeed or Lighthouse scores. It is especially useful for content-heavy sites, WooCommerce stores, and marketing pages loaded with tracking pixels. Developers comfortable editing a keyword list of script handles will get the most out of it.

Who Should Skip It

If your site only loads a handful of scripts or already scores well on Core Web Vitals, this plugin will offer negligible gains and just add another config to maintain. Sites with critical interactive JavaScript on first paint (single-page apps, calculators, booking flows) should also skip it, since delaying those scripts will break functionality.

The Bottom Line

Flying Scripts scores 82.55/100 and delivers a focused, well-maintained solution to a real performance problem: render-blocking third-party JavaScript. The main caveats are the tiny rating sample and the unresolved support thread, which mean you are trusting the developer rather than a proven track record. For the right site it is a cheap win, just be prepared to test interactions carefully after enabling it.