Speeded-up and Tack on

Tack on and speeded-up are semantically related. In some cases you can use "Tack on" instead a verb phrase "Speeded-up".

Tack on verb - To join (something) to a mass, quantity, or number so as to bring about an overall increase.

Speeded-up and tack on are semantically related. Sometimes you can replace phrase "Speeded-up" with "Tack on", this terms are similar.