Lessons
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Introduction
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Search engine optimization
- Broken links
- Site map
- Micro-markup
- Robots.txt
- References
- Text
- Duplicates
- Basic
- Pictures
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Speed
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Minification
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CSS minification
Minification of JavaScript files
Minification of inline CSS code
Minification of images without loss of quality
Minification of JavaScript files
Unused CSS code
Data optimization:Image URLs
Format of animated images
Unused JavaScript code
Using WebP
Image compression is missing
Video bitrate
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Reducing requests
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An overabundance of small pictures
Ungrouped CSS files
Ungrouped JavaScript files
An overabundance of fonts
Availability of end-to-end CSS, JS files
The presence of a monochrome font
Uploading duplicate files
Using JS facades
Redirecting JavaScript code
Adding lazy loading
Redirect from/to www version
- Fonts
- Loading time
- Server Settings
- Pictures
- The first content
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Minification
- Mobility
- Bugs
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Convenience
- Social networks
- Web Application Manifest
- Favicons
- Basic
- Text readability
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Security
- Encrypted connection
- Exploits
- Vulnerabilities
Uploading duplicate files
The page may load duplicates if the same file has different links. Compare https://example.com/image.png?v=1001 and https://example.com/image.png?v=2001. The file is the same, but due to different parameters, the browser will load duplicates.
If such links are on the same page, then it’s half the trouble. If the problem concerns the entire site, then this will mean that when you visit a new page, the user downloads the same file every time, since caching will not work.
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