i would think some warming up would be an important thing to make sure they tacky enough, but i always figured proving the right temps and compounds that slicks would give you the best performance and allow you to push the bike even harder? but having never used them i guess i don't really know, so JMO.
Slick tyres when warmed up, as previously mentioned, have shit to blanket road holding qualities which (when you are not used to them) make you wonder where the limit of adhesion really is. When I first rode with slicks, I kept going round the track thinking " I can go faster on this corner" time and time again until I nearly lost it big time. If you then revert to a road tyre on the same machine, you have to be very careful you don't overcook things. Road tyres have come on in leaps and bounds over the last 10 - 15 years just like our bikes themselves. Unless you are a semi-pro racer, its doubtful whether you could fully extend the potential of your bike on road tyres, let alone slicks. I used to think I was quite good backing my bike into corners on track days until one of the instructors came past with one hand on the bars looking back at me! I could have sworn he was laughing under his helmet the ba****d!! :blush: