JavaScript is also a factor causing slow speed of Magento sites because when the browser processes a web page, it will load all HTML, CSS and JavaScript in an order from the beginning to the bottom. The browser often takes more time to load JS than HTML and CSS, which increases loading time and have bad impact on the whole site performance. Therefore,
deferring JavaScript is one of the best way to improve this issue effectively.
- Delay JavaScript loading till the last moment until the browser finishes processing HTML and CSS
- Defer Iframes effectively
- Improve page rank on Search Engine Result Page
- Enhance site speed quickly
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