Set up on the new bike will be the biggest part in how it rolls along, firstly pop the wheels out and check the axles, these, are often over tightened at the build stage and feel stiff, brakes being cable disc are rarely set up properly either, the 'static' pad on the inside of the caliper should be wound out to the disc as close as it can, a passing glance on the pad is fine, you can see if it's too much by if it visably slows the wheel spin, then set your cable side up, wind ut the adjuster on the bars a few turns. Pinch the caliper arm to stop the wheel as such and reset the cable there, undo the adjuster on the bars and the brake should be sharper feel,
Check the derailuer hanger is straight visually from behind, very frequently bent in transit, headset will more than likely be lacking in grease! - hubs too, I would normally prestretch the cables when setting up to prevent the 2-3 weeks use Its not working properly call!
I do apologise if this is simply telling you what you already know, but thought it may be helpful!