Having tested the speed of my website pages, I noticed that the WP YouTube Lyte plugin sometimes does not work as expected. I searched for a substitute for that and came up with LazyLoad Plugin for Images, Videos and Iframes by WP-Rocket.
I double-checked its functionality and yielded best possible results for website optimization. For this reason, I should admit that website management is in fact in a state of flux all the time and you need to update your knowledge and expertise constantly.