Convert image thumbnails always to jpg/webp

[Emaxo]

It would be really helpful if all images uploaded to the site (whatever the starting format) were converted to jpeg or webp for the thumbnails. Being both compressed formats they would allow faster loading and greater space optimization.

In my case I have a gallery full of PNG images in high resolution and obviously the thumbnails being in the same format even if at a lower resolution require a high loading time.