If you were to view a user's comments it loads every comment and every thumbnail on 1 page. This isn't an issue for average user's comments, but power users will freeze browsers like Internet Explorer that load every image into memory rather than loading them as they're visible. This could be a potential exploit for denial of service server-side, but I'll leave that up to you to decide.
Pagination would be good on user comments.
Example power user (kristifigure, 15000+ comments)
Pagination would be good on user comments.
Example power user (kristifigure, 15000+ comments)