The phrase "to increase the speed to high" means to accelerate or go faster, bringing the vehicle's speed up to its maximum capacity.
Sentences with «to increase the speed to high»
Whisk on low just until comes together then increase speed to high until smooth. (holajalapeno.com)
Immediately remove the bowl and place it on your stand mixer with the whisk attachment, beating slow at first and gradually increasing the speed to high. (rodellekitchen.com)
Select Variable 1 (not 1 +), turn the machine on, and slowly increase speed to the highest setting. (the-broken-bread.com)