ADSON.COM turns OFF 'Slow ADS'.
ADSOFF.COM turns ON 'Slow ADS'.

These utils will (only?) work with Cyrix 6x86.
Use them if you wish on your own risk. Your system might get
unstable, but mine didn't.

Also 6x86opt v0.77 (6XOPT077.ZIP) is capable of turning on/off
those bits.