SWIS Performance
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About SWIS Performance
Your contact page doesn't need to load the homepage slider's code
A WordPress site keeps adding plugins, and each one tends to slip its scripts and stylesheets into every page, even if it only uses them on one. The browser downloads and processes code the visitor never sees, and the page takes longer to show. People who install a performance plugin often look for a magic button, but what really matters is deciding what loads, when and on which page.
SWIS Performance brings together the tools for that job in a single plugin: caching, JavaScript and CSS control, and settings for external resources.
Caching, JavaScript and CSS: what SWIS Performance does
- Page caching: reduces the work PHP and database queries have to do on every visit.
- Defer or delay JavaScript: prevents scripts from blocking rendering.
- Async CSS and critical CSS: the stylesheet loads without blocking the page, and critical CSS avoids the flash of unstyled content (FOUC) that can appear when loading it this way.
- Minification: removes extra white-space from JS and CSS.
- Compression and expiration headers: improve browser caching on repeat visits.
- Disable unused JS and CSS: you can manage scripts and stylesheets site-wide or on specific pages.
- Settings for third-party resources: DNS prefetch and preconnect hints, Google Fonts with local hosting and preloading of fonts and CSS.
- Customizable speculative loading: so navigation between pages of the site feels smoother.
What to be clear about
SWIS Performance does not optimize images: that is handled by EWWW Image Optimizer, a separate product. Static resources are served from a CDN with the Easy IO CDN, which is purchased together with SWIS. And there are no guaranteed figures: how much your site improves depends on your hosting, your theme and the plugins you load.
Common questions before turning it on
Does it help if I already have many plugins installed?
It lets you remove, from the pages where they are not needed, the scripts and styles those plugins load by default.
Can it break anything on my site?
Delaying JavaScript or disabling resources can affect menus, forms or sliders if the script was needed. Turn changes on one at a time and check your key pages.
Does it replace an image optimization plugin?
No. It deals with caching, scripts, styles and fonts. Images need a specific tool.
Does it include a CDN?
CDN delivery relies on Easy IO CDN, which is purchased together with SWIS.
Scripts are disabled page by page, and each change deserves a test
Start with the pages that get the most traffic (homepage, product page, contact) and see which scripts and stylesheets they load without needing them. Disable one, reload and check that everything still works before moving on to the next.
Leave critical CSS and deferred JavaScript for later: they change how the page is painted, and it is better to assess them once caching is stable.
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Version history
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2.5.0 Current 15 Aug 2025
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Frequently asked questions
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GPL (General Public License) is the license under which WordPress and most premium plugins/themes are distributed. It grants you the right to use, modify and redistribute the software in as many projects as you want, with no domain restrictions.
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Yes. With membership you get automatic updates via our GPLClub Updater plugin (installed on your WP, detects new versions and applies them). With individual purchase, you get one year of manual updates from your account.
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Depends on the plan. Monthly: 3 domains. Semi-annual: 7. Annual and Lifetime: 15. Individual purchase: 1 domain.
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GPLClub offers its own support for installation, configuration and compatibility. For direct support from the original author (feature requests, product-specific bugs), a license purchased from the author is required.
