topspeed
nounUK /ˌtɒp ˈspiːd/
US /ˌtɑːp ˈspiːd/
The fastest speed something can go.
The race car reached its top speed on the straight road.
OTHER MEANINGS
2. The highest level of performance or activity.
The factory ran at top speed to finish the order.
3. The fastest setting of a machine or device.
He set the fan to top speed on a hot day.
4. The greatest rate of progress.
The team worked at top speed to meet the deadline.