LiteSpeed Cache for WordPress Settings: Optimize

Optimize and Tuning are two closely-related tabs. Generally-speaking, you will find the ON/OFF switches in Optimize, and the customizations that go along with these switches in Tuning.

For a detailed explanation of what these tabs do, please see Optimization Through Minification and Combination

Please test these options thoroughly before enabling them on your production site!

off

Extra white space characters, new line characters, and comments will be stripped from all included CSS files, if this option is enabled.

off

Extra white space characters, new line characters, and comments will be stripped from all inline CSS code on the HTML page, if this option is enabled.

off

All individual CSS files will be combined into a single CSS file.

off

CSS will be sent to the browser before it is requested.

off

Extra white space characters, new line characters, and comments will be stripped from all JS, if this option is enabled.

off

Extra white space characters, new line characters, and comments will be stripped from all inline JS code on the HTML page, if this option is enabled.

off

All individual JS files will be combined into a single JS file.

off

JS will be sent to the browser before it is requested.

604800

The minified and combined files are cached. This setting specifies for how long. The minimum is 3600 seconds, but we recommend 604800. When a Purge All command is issued, the minified and combined CSS/JS are included in that purge.

off

Extra white space characters, new line characters, and comments will be stripped from all HTML, if this option is enabled.

off

Page loading can be delayed while waiting for CSS definitions to load. When you load CSS asynchronously, the contents of the page no longer have to wait for CSS to be loaded first. This setting also applies to Google Fonts.

If you have critical CSS styles and definitions that must be loaded for above-the-fold content, you can specify it in the Critical CSS Rules box.

ON

NOTE: Load CSS Asynchronously must be set to ON for this feature to work.

When CSS is set to load asynchronously, it can cause some content to be loaded before the browser knows how to display it. For this reason, whenever Load CSS Asynchronously is enabled, LSCache figures out what CSS is critical to the current display, and loads that part first.

This Generate Critical CSS in the Background setting determines whether that calculation is done in the foreground, or in the background. This is ON by default. That means it is a background function, and uses a cron-based queue. When a page is viewed, if there is no critical CSS defined for that page type, a request is added to the queue, and the page continues loading without waiting.

This is what you may see when there are pages waiting in the queue:

If your cron is disabled (or you are impatient) you can press the Run Queue Manually button to hurry the process along.

If Generate Critical CSS in the Background is set to OFF, then the critical CSS is generated in the foreground, immediately when the page is requested. This means that the visitor must wait for the critical CSS calculation before continuing to view the page. This has the potential to slow down page load.

off

This setting takes all scripts and loads them only after the HTML is finished loading.

on

This setting excludes JQuery from all of the above optimization measures. It is recommended that this setting remain ON, particularly if you have inline JavaScript. If you are experiencing errors when JS Combine is enabled, turning this setting on should eliminate them.

Empty List

With this setting you may perform DNS resolution for the listed domain(s) before it is requested. By prefetching DNS results, latency can be reduced significantly for your visitors as they click external links, particularly on mobile networks. Domains should be entered one per line in the format //www.example.com.

Learn more.

OFF

By default, comments are preserved when JS and CSS are minified, but these comments can take up valuable space. Enable this option to strip comments from minified files and make them more efficient to transmit.