"Maximum speed" refers to the highest possible rate or velocity at which something can move or travel. It indicates the fastest achievable speed within a given context or limit. Full definition
Not only can you save up to 40 hours of Full HD resolution videos, but those files can be transferred onto the card at maximum speed of 100 MB / s. (androidauthority.com)
If science has limits, then it might be moving at maximum speed just before it hits the wall. (discovermagazine.com)
Of course, hitting the city's maximum speed limits of 25 or 35 mph was easy. (cnet.com)