The phrase "overall smoothness" means everything is going well and without any major problems or difficulties. It refers to a situation or experience that is generally easy, calm, and pleasant. Full definition
The crank driven balancer further enhances overall smoothness of the bike. (policybazaar.com)
Aside from a slight refinement issue under load and at mid range revs, it impresses with overall smoothness and silent running nature as well as the level of urge it can deliver. (drivemag.com)
PDK comes reasonably close to a good torque - converter automatic in overall smoothness, even as it allows the same control as and better shift speed than a conventional manual, or better, smarter, faster shifting in full - auto mode on a track. (autoweek.com)