If that doesn't work...
If u try that and your windows are still sluggish you may want to check the switch to see if the contacts inside of it need cleaned. My windows slowed down and eventually quit working all together. I originally thought that the glass was hanging up, and could use some grease,the motors were weak,etc. 'till my windows quit working all together. now that I've taken my switch apart(after much troubleshooting,and choice words),cleaned it and put it back in,my windows work better than they did when I purchased my car. That's my 2 cents.