Laptop (OSX 10.10) is 'exact' Old iPhone 4 (iOS 7) is 0.2 seconds behind, +/- 0.18 second error - 'good'. New iPad (iOS 9) is 2.1 seconds ahead, +/- 0.08 seco

Laptop (OSX 10.10) is 'exact' Old iPhone 4 (iOS 7) is 0.2 seconds behind, +/- 0.18 second error - 'good'. New iPad (iOS 9) is 2.1 seconds ahead, +/- 0.08 second error - 'bad' (through 3x reloads, same amount each reload). Seems to be an issue...