Speed performance
SeoChecker indicates in a table like the one below preload candidates based on the third level of requests in the critical request chain.
Imagine this is a critical request chain of a page:
index.html |--app.js |--styles.css |--ui.js
SeoChecker would choose ui.js and styles.css as candidates.
Indeed, <script src=”app.js”> is declared by the index.html file: once app.js runs, fetch() is called to download ui.js and styles.css.
As long as they are downloaded, parsed and executed, the page does not show up.
If you declare preload links, you can make the pages load faster: the potential savings depend on when the browser is able to initiate the requests.
Learn more about Speed performance
On page SEO performance and page checkup.
Over 300 parameters for the deeper page analysis.
Share this Guide
Did you like it? Share it!
Web tools for modern developers. Try these one!
Over 50 generators, builders and validators to improve your SEO and web performances
Builders and generators
Generate structured data in json-ld and improve your SEO. Enhance your appearance in Google Search with rich snippet result.
Converters
Pixel - Rem - Point units converter. Convert Pixel to REM or Point unit in seconds and vice versa with this free converrter.
Tester and validators
Validate your Css file sheet with W3C validation Service. Check if the markup of your Cascading style Sheet document is W3C compliant.
Check SEO performance and page checkup. Over 250 parameters for the deeper page analysis. Find out more about the performance of your website.
Images
Upload yours images and get the color palette. Get color palette for all dominant colors identified in your uploaded image.
Analytics Google Tracking script
Build your Google Campaign Url for better tracking. Add UTM parameters and track Custom Campaigns in Analytics account.
Convert Bits, Bytes, Kilobytes, Megabytes, Gigabytes, Terabytes and so on. Set number and choose unit to convert. Try it for free.
Test your web pages structured data. Check conformity of your structured data json-ld and improve your SEO.