speed·up 
/ˈspi:dˌʌp/ noun
plural speed·ups /ˈspi:dˌʌp/ noun : an increase in the speed or rate of something [count] — usually singular ▪ Economists are worried about a possible speedup in/of inflation. [noncount] ▪ I'd like to see some speedup in the selection process. — see also speed up at 2speed
