I think your major problem is the number of files you’re loading.
You are loading around 370 images at once.
You should implement the infinity scroll, which loads only what in viewport.
The load time can be optimize a bit, you have really small 15 css files and 29 js files.
Merge them to one file will enhance the file size but reduce the number of requests.
You should also upgrade the num of cors on your server. It should help a bit.
