Thanks for creating this nice plugin! I have one ask – I’m trying to eck out as much speed as I can, and am in no need of maxresdefault sized thumbnails at any time. I need to be able to specify sddefault, or even mqdefault, as an overriding option – editing PHP is a viable option for me if necessary. Pagespeed insights LCP, INP FCP, and possibly CLS and TTFB could all be improved.
For example, a thumbnail at maxresdefault is ~160kb, and the sddefault image is ~21kb. And for 10 images, that adds up!
For a single video source type, this is not as critical, but still wanted. For the playlist source type, it’s very heavy, as each of the thumbnails are scaled small, yet are using maxresdefault sized images.
Thanks!
YT image sizes:
Maxresdefault: The maximum resolution available
Hqdefault: The standard size
Sddefault: The high size thumbnail
Mqdefault: The medium size thumbnail
Default: The default image