If we use Google’s PageSpeed Insights tool to analyze our WordPress it is quite likely that among the elements to be corrected is the following:
What does this mean?
Lazyload CSS upload
First of all, lazyloading of CSS style sheets is not recommended because, if it is done, the page will initially be displayed without any layout, only to be laid out at the end of loading, which often causes a strange effect on loading.
To check if the applied code has worked we can load our website and view the source code, to analyze if the .js files are loaded at the end. Keep in mind that not necessarily all .js files will move to the bottom of the web.
One option would be the plugin SG Optimizer or WPRocket.
That way, in case there are problems after activating the plugin we can always apply changes in the configuration to see if the problem is solved.
There are other plugins that do the same thing, with more or less added options, but these 2 are the ones we recommend.
Remember again that in case of trying any of these plugins or code modifications we will have to test on the front end of the web to verify that everything is still working as it should.
It is also important to note that this lazyloading does not always translate into an improvement in the score we get in PageSpeed, it may even be the case that the score drops.
In such cases, it is also advisable to deactivate these plugins.