URLs contain JavaScript files of size over 25 KB. The figure of 25KB is relatively arbitrary – there is no hard and fast rule as to what constitutes an JavaScript file that is ‘too large’.
Why it’s Important
A lower JavaScript file size/payload or reduces the time spent parsing scripts, resulting in faster page loads and improved page experience.
How to Check the Issue
The Sitechecker SEO tool’s “Page Speed” category highlights specific performance issues that could slow down your website, one of which is “JavaScript file size is over 25 KB.” This particular issue is detected when a JavaScript file exceeds 25 KB, which can impact page load times and user experience.
When you navigate to this issue within the tool, you’re not just presented with a number. Instead, the tool offers a comprehensive breakdown, including a list of pages affected by oversized JavaScript files. Each entry provides details like the file size and the specific JavaScript file causing the bloat, helping you pinpoint where optimizations are needed most.
Accelerate with JS Compression
Reduce your JavaScript file sizes and improve page load times with our easy-to-use Minify JS tool.
How to Fix the Problem
Reduce JS file sizes by removing comments, white spaces, and redundant code, and in some cases, use shorter variable and function names.
Minifying your JavaScript is less impactful on the overall page experience when compared to other optimizations like code-splitting, eliminating dead code, and caching your JavaScript code.
Hence, minification is a lower priority optimization that should be regarded as a fine-tuning step to refine your page experience rather than single-handedly boost your page performance.
