phaserjs/phaser#2178

However, in practice it seems like the only way to have tweens running for a fixed amount of time regardless of the device speed is setting frameBased to true.

There are a couple of threads on the forms about it:

http://www.html5gamedevs.com/topic/18183-tweenmanagerframebased-not-working-as-expected/
http://www.html5gamedevs.com/topic/18242-tweens-duration-different-on-different-machines/

v2.4.1 to v2.16.2

Will be fixed in v2.17.0, by removing frameBased!