Do you have a link you can share? I think the project grid with thumbnails could benefit greatly from Jampack but I would need to see the page to confirm.
Yes, this is a perfect use case for Jampack. You have simple large images in HTML <img>. Jampack would make them responsive with multiple sizes so mobile phone get small images and desktop larger images. And images would be made lazy when outside the screen. Mobile phone would download 1/10th of the data I guess.
Not my site, but mine (in progress) is almost exactly the same UX/UI but with zero dependencies or libraries/frameworks.