Minified JavaScript

Silktide checks whether the script files your page downloads have been minified - rewritten to remove the spacing, comments, and long names that only matter to people reading the code. Unminified scripts are much larger than they need to be, making the page slower to load.

changes nothing about what the code does. For example:

// Before minification: readable, but heavy
function calculateTotalPrice(itemPrice, quantity) {
    return itemPrice * quantity;
}

// After: identical behavior, a fraction of the size
function c(a,b){return a*b}

Why this matters

is often the heaviest thing a page downloads, and unlike images it must also be processed before the page becomes fully interactive. Unminified scripts routinely shrink by half or more, and that saving repeats for every visitor on every uncached page view - visitors on phones and slower connections feel it most.

Because minification is automatic and changes no behavior, unminified production scripts are almost always an oversight: a build step that was skipped, or development files deployed by mistake.

How to fix it

Turn on minification in the site's build process. Every modern build tool includes a minifier, usually enabled by default in production builds.
If the site has no build process, check the : most have a setting or plugin that minifies scripts automatically.
As a last resort, run files through a standalone minifier before uploading them. Keep the readable originals - you edit those, and publish the minified output.
If a reported file belongs to a third party, check whether they offer a minified version, which most do.

How Silktide tests this

Load the page in a real browser, using the device type, connection speed, and test location configured for your speed tests.
Examine each script file the page downloads and estimate how much smaller it would be if minified.
Report each file with a meaningful possible saving, and grade the page by the total: around 50 KB of potential savings is graded down, and 250 KB or more is graded as poor.

Troubleshooting

The file already looks minified

Minifiers differ in aggressiveness, so a lightly compacted file can still contain meaningful savings. The check reports how much smaller the file could be; running it through a current minifier usually captures the difference.

We need readable code for debugging

Keep readable source files in your project and debug with source maps, which let browser developer tools show the original code while visitors receive the minified version. You never need to serve readable code to get readable debugging.