Video Lightbox or Vimeo?

Hi all, this is my first post.
Firstly I have to say that I’m enjoying using Blocs, never has it been this easy, and with so much control, for an amateur to create a great looking website! Thanks for that!

I am having trouble getting a page to look and work exactly how I would like it. I am creating several pages which should contain 15 to 20 videos each. The videos range in size from 10mb to 18mb. Currently they are on Vimeo.

If I use the Lightbox and Video settings in Blocs, I would have to keep all the videos locally in the website folder. I like the fullscreen option and of course all the benefits of using the Blocs Lightbox.
(Although I am having some trouble with navigation arrows not working in Lightbox.)

My question: will Lazy Load prevent the page from loading all the videos at once, so that the videos only load once the visitor hovers and clicks the image triggering the Lightbox.

Thanks!