The performance score makes up 70% of the overall score.
We test the coolers' performance by loading each one with drink bottles to about 20% of its capacity. The coolers are preconditioned to 32°C. The tester fills each cooler with ice equivalent to 20% of the coolers' volume, closes them and places them in a temperature-controlled room at 32°C.The tester measures the time taken from when the average temperature inside the bottles rises from 0°C to 2°C, and then 2°C to 8°C. The slower the warm-up time, the better the performance score.