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Is Minifying CSS Necessary? (2023)
TL;DR
Minifying CSS by removing whitespace and comments is often debated, but it may not significantly impact performance. The author argues against it, emphasizing the value of accessible source code for learning.
✦ Why It Matters
Consider keeping your CSS unminified for better learning and debugging experiences.
Key Takeaways
- Avoid minifying CSS unless absolutely necessary.
- Use gzip or Brotli for effective compression.
- Test performance impacts with tools like WebPageTest.
- Focus on optimizing critical CSS for better load times.
Full Summary
Minifying CSS involves stripping out whitespace and comments to reduce file size, a practice debated among developers. The author argues against this approach, citing personal experiences and the educational value of viewing source code.
To investigate, a tool was created to measure parsing times for stylesheets with varying numbers of declaration blocks, both minified and unminified. Results showed that even with a 100,000-block stylesheet, the difference in parsing time was minimal—only 54 milliseconds at worst.
The author also conducted tests using WebPageTest, confirming that gzip compression significantly reduces file size without the need for minification. Ultimately, the conclusion is that minification adds unnecessary complexity without substantial performance gains.