Single Points of Failure - SPOFs
Sometimes we include the 3rd party JavaScript files in our site like below,
which causes browser to load it synchronously. Browsers block all rendering of the page until the file has finished downloading. In case, an external service is down or having performance issues, this may cause a script included on our page to take longer than usual to load, or fail to load altogether.
This can cause performance issues on our site although this is not directly related to the performance of our site.
To avoid this, we need to audit our sites for SPOFs and SPOF-O-Matic is great browser plug-in for this.
It flags likely single points of failure and can simulate complete failure for any
external script it finds on your pages.
Many popular services now provide asynchronous snippets that will not block page rendering; this is usually achieved by providing inline JavaScript, which then dynamically creates a script tag so that the JavaScript is loaded asynchronously.
<script src="http://example.com/js/file.js" type="text/javascript"></script>
which causes browser to load it synchronously. Browsers block all rendering of the page until the file has finished downloading. In case, an external service is down or having performance issues, this may cause a script included on our page to take longer than usual to load, or fail to load altogether.
This can cause performance issues on our site although this is not directly related to the performance of our site.
To avoid this, we need to audit our sites for SPOFs and SPOF-O-Matic is great browser plug-in for this.
It flags likely single points of failure and can simulate complete failure for any
external script it finds on your pages.
Many popular services now provide asynchronous snippets that will not block page rendering; this is usually achieved by providing inline JavaScript, which then dynamically creates a script tag so that the JavaScript is loaded asynchronously.
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