Open the metrics.ini file in the theme folder(make a backup first just in case), look for the line [ScreenOptionsMaster] and you'll see the speed section below so copy this whole code and replace it
Speed="24;"
SpeedDefault="mod,1x,no randomspeed"
Speed,1="mod,0.25x;name,x0.25"
Speed,2="mod,0.5x;name,x0.5"
Speed,3="mod,0.75x;name,x0.75"
Speed,4="mod,1x;name,x1"
Speed,5="mod,1.25x;name,x1.25"
Speed,6="mod,1.5x;name,x1.5"
Speed,7="mod,1.75x;name,x1.75"
Speed,8="mod,2x;name,x2"
Speed,9="mod,2.25x;name,x2.25"
Speed,10="mod,2.5x;name,x2.5"
Speed,11="mod,2.75x;name,x2.75"
Speed,12="mod,3x;name,x3"
Speed,13="mod,3.5x;name,x3.5"
Speed,14="mod,4x;name,x4"
Speed,15="mod,4.5x;name,x4.5"
Speed,16="mod,5x;name,x5"
Speed,17="mod,5.5x;name,x5.5"
Speed,18="mod,6x;name,x6"
Speed,19="mod,6.5x;name,x6.5"
Speed,20="mod,7x;name,x7"
Speed,21="mod,7.5x;name,x7.5"
Speed,22="mod,8x;name,x8"
Speed,23="mod,C200;name,C200"
Speed,24="mod,C200;name,C400"
Save the file and it should work, in case there's some crash or error send me a PM to help.