Though there are several plugins available to fix the frequently observed issue of render-blocking JavaScript and CSS in above-the-fold content, it is important to know what exactly is going on behind the scenes. This is so because plugins available for handling the issue have a number of configurations and options to set up. So, it’s important to understand the issue beforehand to make necessary to cope with actions and plugin settings.
Two primary methods used to do so are defined as follows:
The main idea here is to move needless JavaScript and jQuery resources out of the critical rendering path. This is achieved by means of using one of the two HTML attributes, async and defer.
The primary difference between the two attributes is that the defer attribute ensures order, while async doesn’t. Nonetheless, working is the same in both ways.
Another great way to eliminate render-blocking JavaScript and CSS in above-the-fold content is by means of optimizing the delivery of CSS resources. It is much effective but needs sound technical expertise. To do so, you need to:
Render blocking CSS is not impossible, but difficult to apply, especially if you don’t know how exactly it is working.
PageSpeed tool is a free online program offered by Google to let businesses check for website optimization across a number of factors, including the elimination of render-blocking JavaScript and CSS in above-the-fold content optimization. The tool analyses any webpage content and then generate suggestions based on its findings.
Here is other optimization available from Google PageSpeed Insights. In addition to eliminating render-blocking JavaScript and CSS in above-the-fold content, businesses looking to optimize sites need to:
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