Hi!
First of all, this is a problem with Wix Pro Gallery component.
I suggest you several ways to solve this problem.
- Use any other gallery (not pro gallery) for dyn page. As i see you don’t use possibilities like “zoomed view” or text/videos items (it’s impossible with wixCode for now BTW…), so you can use something like this - 2018-05-24_1357
- Convert images from PNG to JPG format / lower their resoultion. I downloaded one random image from your collection - it’s size is 3.29 megabytes, and i think all other are prety much the same. By lowering resolution/converting to jpg you will make gallery more stable + increase speed of opening these pages.