Total Performance Rating
The TPR graph is a combination of all our benchmarks in which we test our netbooks and notebooks. The TPR number is a combination of:
Battery life in performance and power saving modes, iTunes encoding time and Movie encoding time.
Due to the nature of some benchmarks where scores having a lower is better result, we've had to change the way we do the numbers when compared to other products. Battery life numbers in performance and save modes are combined outright since higher is better. In iTunes encoding and movie encoding where a lower number is better, we have a base number of 2500. The score we get from the machine in iTunes and movie encoding are both subtracted from that base number and then added to the sum of the battery life scores for the final score.
For example, if the performance battery life score (in minutes) is 100 and the power saving battery life score (in minutes) is 125, those numbers will be totalled. The lower is better scores for iTunes in the example is 500 seconds and the movie encoding is 1000 seconds for a total of 1500. That 1500 would be subtracted from the 2500 base score to get 1000, which would then be added to the 225 in battery performance for the final score. That total score would be obtained by using the following equation: (2500 - 1000- 500) + (125 + 100) = 1225.