Bike weight or rider weight? Plenty of places to loose weight without resorting to cash?
Loose X amount of flab resulting in huge performance increase!
Do you need all that crap in your camelbak, Mobile, GPS, just in case crap, water proof?
Have I taken off all the bits I dont need on the bike – commute lights, gps holder, watter bottle holder, under seat bag?
Do you need upppy down seat post for the race?
My own view is that it is far easier to knock off a Kg of body weight than worry about a few grams of weight on components. I think componenets should be robust and fit for purpose. For example I do use a full XTR group set but thats because its strong, light weight and seems to last forever with really slick shifting not because it weights X grams less than SRAM. +1 Geometry and suspension design is equally important.