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
Display time of the first graphic
The user decides to stay on the site or leave within the first 15 seconds after opening the page. Therefore, it is important to show at least some content as early as possible, without waiting for the final page load.
If this is a landing page, then it is important to show the user the first screen where the USP of the site is formulated. If this is an online store catalog page, then you need to display a panel with filters and the number of pages so that the user can estimate the width and depth of the product range. If this is a blog page, then you need to display the title, the first paragraph, the table of contents or the first picture that sets the tone for the entire material.
You have only 15 seconds to get the user interested. By speeding up the display time of the first content by 1 second, you will give the user 6.5% more time to analyze your site. This greatly increases the likelihood that you will be able to interest the user and he will continue to explore the site.