This rule is triggered when PageSpeed Insights detects that one of your resources can be reduced in size by a reduction operation.

Reducing resource size means removing unnecessary bytes (for example, redundant spaces, newlines, and indentation). Compressing HTML, CSS, and JavaScript improves download, parsing, and execution speed. In addition, for CSS and JavaScript, you can further reduce the file size by renaming the variable name during the appropriate update to the HTML to ensure that the selector continues to run.

You should reduce the size of HTML, CSS, and JavaScript.

要縮減HTML的大小，您可以使用PageSpeed Insights Chrome ExtensionsTo generate the optimized HTML code. Analyze the HTML page, and then browse the "Reduce HTML Size" rule. Click View Optimized Content to get the optimized HTML code.

要縮減CSS的大小，您可以嘗試使用YUI Compressor和cssmin.js.

To reduce the size of JavaScript, try using theClosure Compiler、JSMinOrYUI Compressor. You can create a build process that uses these tools to reduce the size of the development file, rename it, and then save it to the official version directory.

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