Galleries slow to load

Elements
1

I’ve just uploaded my Elements site, replacing my Classic site. Everything works beautifully. But I have many photo galleries and they are slow to load even though I am on a fibre optic network. The image files are not large, as well as images on pages. Is there a way to lazy load images? This was accomplished with a stack in Classic.
Here’s the site: http://www.northfrontenaclittletheatre.com/
People nowadays are impatient. Waiting for something to load without knowing why because it seems the screen is frozen, discourages people to get onto the site.

2

The size of this photo is huge 3024 x 4032 pixels and 410 kB. You can print this. Get Squash Powerful Batch Photo Editor for Mac - Squash

bild
bild228×332 48.4 KB

3

Thanks. I forgot to reduce the size for this photo. I’ll get Squash.

4

It’s not the only one -

Four actors in costume are performing on stage in front of a red curtain while an audience watches. (Captioned by AI)
Four actors in costume are performing on stage in front of a red curtain while an audience watches. (Captioned by AI)1920×1080 388 KB

5

I guess I better go back and check all my images.