Slotted or blanks will have no bearing on heat dissipation from the rotor. Leaving the car parked while the brakes are hot leads to cracks and warpage. Always cool down the brakes before parking.
Pad types are what determines wear rates of rotors and heat generated.

IMO slotted are for looks. Blanks will perform just as well and are cheaper. If anything slotted rotors will reduce the life of the pads. Use an aggressive pad for the track meets and change rotors when they are shot. I use the 750 deg QFM pads on my car for daily and the occasional skidpan. Dust shields removed, decent fresh fluids and all works well.

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MY00 WRX. 89 Prelude. 99 CRV