I realize this has been beaten to death, but I just came off a discussion
where the dev folks implemented ajax for
1. filters, pagination, larger image view, sort, change # of products (like
the ones in http://tinyurl.com/ythdmx)
2. content tabs
They claimed faster page load time as the biggest reason for doing it (and
most other people in the room were sold). I didn't agree and these are the
reasons I gave and they countered each of it:
1.