Use full-res images in pictures.

The full-res images are only a few MB in size.
There's probably some way to load the low-res images first, then load the high-res images. That way the site can still load quickly, and then the high-res images can replace the low-res ones as/once their loaded in.
This will make the committee page look better, but still be very fast to load.
There's also probably some way to detect if the user is on a metered connection, and only load the low-res images, but that's for someone else to figure out.