Speed boosting is a term for using certain dribble moves that give you a "speed boost" or increased acceleration. Only players with a 86 or higher Ball Control attribute may speed boost/momentum dribble.
In 2K19 your attributes go up or down based on how hot or cold your player is. This means you can gain or lose the ability to speed boost if your Ball Control is near 86. If you want to be able to do speed boost moves all the time we recommend that you go for a higher than 86 Ball Control.
Note: There is a bug, on XBOX only, that is causing players to need 87 Ball Control to speedboost. 87 was not required at launch and it's unknown if it will be fixed.
This table is from a 2K developer tweet.
Archetype combinations that can speed boost:
86 Ball Control - Speed Boost
|Passing & Ball-Handling||Rebounding||5'7-6'5||Default or lower|
|Passing & Ball-Handling||Defending||5'7-6'5||Default or lower|
|Passing & Ball-Handling||Passing & Ball-Handling||5'7-6'8||Default or lower|
|Passing & Ball-Handling||Post Scoring||5'7-6'5||Default or lower|
|Passing & Ball-Handling||3PT Shooting||5'7-6'6||Default or lower|
|Passing & Ball-Handling||Shot Creating||5'7-6'6||Default or lower|
|Passing & Ball-Handling||Driving & Finishing||5'7-6'6||Default or lower|
|Shot Creating||Passing & Ball-Handling||5'7-6'5||Default or lower|
|Shot Creating||3PT Shooting||5'7-6'1||Default or lower|
|Shot Creating||Shot Creating||5'7-6'3||Default or lower|
|Shot Creating||Driving & Finishing||5'7-6'3||Default or lower|
|Driving & Finishing||Passing &Ball-Handling||5'7-6'4||Default or lower|
|Driving & Finishing||Shot Creating||5'7-6'1||Default or lower|
|Driving & Finishing||Driving & Finishing||5'7-6'1||Default or lower|