Why do software installation or updates always go very fast up to 90% complete, then the last 5-10% takes so much longer?

Question

Why do software installation or updates always go very fast up to 90% complete, then the last 5-10% takes so much longer?

In: Technology

Answer 1

Computer aphorism: The first 99% of the install takes 99% of the time. The last 1% takes the other 99%.