I wasn't a weight weenie, until I found myself climbing all the time. I haven't gone to ridiculous lengths, but I try to cut weight where the cost-to-weight ratio is low. Wheels, pedals, seat post and saddle seem to take up quite a bit weight, maybe start there and try cutting? My budget alloy frameset build weighs in at just under 20 lbs. with 2x crankset, full hydraulics and 11-36t cassette. Though I could still see myself cutting weight in other areas.