Another best practice to follow to improve the performance of our website for those old devices, which have limited functionalities and are not as fast as today's mobile devices.
We know that since we have the Internet, we have web browsers to display the content. We should not forget that there are users who still use older mobile devices and which lack the features of modern equivalents; we can handle this using graceful degradation.
Graceful degradation is a strategy, which is used to handle the design of web pages for different browsers. If we built a website using the graceful degradation strategy, then it is intended to be viewed first by the modern browsers and then in the old browsers, which have less features. It should degrade in such a way that our website still looks good with respect to look and feel and is still functional but with less features.