FlyingPress

Custom HTML parser Previously, we relied on third-party HTML parsing libraries to parse HTML and implement various optimizations. This helped us build features quickly, but these libraries had their drawbacks – for example, they sometimes parsed HTML incorrectly when it contained invalid tags, and also required higher resource usage on servers, especially on shared hosting.

After months of hard work, our engineers have developed a custom HTML parser specifically designed to meet our needs. This has resulted in an incredibly fast parser that can handle invalid HTML with minimal resource usage.

Lightning-fast & improved removal of unused CSS FlyingPress was the first WordPress plugin to introduce automatic removal of unused CSS. With version 4, we’re taking it to the next level. Our engineers have created a new engine with a custom-built CSS parser to remove unused CSS even faster.

Results: FlyingPress can now remove unused CSS from complex pages in less than 30 milliseconds with minimal resource usage. It will remove unused CSS from every post and page on every preload.

We have also removed the “Purge Used CSS” button. 😉

Preload cache, without purging! With FlyingPress version 4, you can preload your cache without purging it. As you preload, existing cached pages will be overwritten one by one instead of purging the entire cache. Visitors will continue to see previously cached pages until the new cache is generated.

If you prefer to purge first and then preload the cache, this option is still available with just one click.

Always on Caching Previous versions of FlyingPress allowed you to disable page caching if desired, especially if you were using external caching layers such as Nginx, Varnish, or Cloudflare APO. However, this often causes conflicts, confusion, and decreased performance for real visitors as most of these external caching layers cannot preload cache.

FlyingPress version 4 now always caches pages, serving as a fallback cache if the external caching layers do not have the cached page, thereby maintaining a high cache hit ratio.

Delay all JS files or only selected FlyingPress has always had the option to delay selected JavaScript files and load them on user interaction, pre-filled with common third-party scripts. However, many customers have websites that can render above-the-fold without any JavaScript files. With version 4, you can delay all JavaScript files for even better performance.

Responsive interface The FlyingPress dashboard is now fully responsive, allowing you to configure, purge, and preload from anywhere, even on mobile devices.