Your Ini settings were probably incorrect. Whenever you change revisions, you probably should delete setting files. Core changes can cause errors and issues if the settings are different.
Also, you may have just pressed F10.. which makes it so that there is no limit to the games emulation.
F11 shows frames & frameskip rate
F10 full speed throttle toggle
F9 increase frameskip
F8 decrese frameskip
Skipping frames can help run slow games at increased speed... but the more frames skipped, the more 'jerky' the games motion will look.
Theres also an Auto frameskip option... which applies skips based on performance. I think thats the default... which IMO, isnt a good thing to do. I tend to use either a set skip rate, based on observation in play-tests, or turn Ill just turn it off completely.