Originally Posted by Russ Roth

Crankset and BB is one spot I would go depending on the riding you're doing. Typically it came with a heavy triple, I'd replace that with a lightweight double or even 1x. The crank is easily replaceable as the bottom bracket is an english threaded. A decent 2 piece crank will work well and you can find some lighter ones on sale. If it says BB30, PF30, or some other press fit it might not be adaptable to your bike. But shimano, sram, bb386 designed for a threaded BB will fit your bike. Downside is a nicer double may require a different shifter and front der. From what I remember the it was a 48/38/28 mtb crankset, putting on a 48/32 crankset will let the shifting system work while having a nice range of gearing. The wheels are also fairly heavy so a decent wheelset can help some as well, usually it came with a rim labeled 750, its a fairly heavy rim as are the hubs, a nicer wheelset can be found for not a lot. After that its just replacing parts with lighter ones for diminishing returns. Its an easy to upgrade bike and a decent rider as is.