slowdown

As nouns the difference between showdown and slowdown

is that showdown is the final battle between two nemeses, in which there can be but one victor while slowdown is a reduction in speed, or a decrease in the level of production, etc.

As a noun slowdown

is a reduction in speed, or a decrease in the level of production, etc.

As a verb reduce is

to bring down the size, quantity, quality, value or intensity of something; to diminish, to lower, to impair.

As nouns the difference between slowdown and riplock

is that slowdown is a reduction in speed, or a decrease in the level of production, etc while riplock is a deliberate slowdown in the transfer rate when reading data from a DVD, so as to reduce the amount of noise from the drive.