iPad 2 Slider Performance (iOS 9.3 beta)

[phet-steele]

@aadish @amyh-phet the sliders on the Mix Isotopes screen don't preform the best on iPad 2 (tycho), with significant lag while adding atoms quickly. The performance slows as well when there are more and more atoms on the screen, so the sulfur sliders become slow quickly, as opposed to the beryllium sliders that only have one isotope available. In case you wanted the FPS, it drops to 5 fps while sliding, after being frozen for a bit. This number was from 1.0.0-dev.5. For phetsims/tasks#488.

[aadish]

tried removing gradient but performance is not that great will be using canvas node

[aadish]

should be tested in next candidate

[phet-steele]

Performance is OK, @ariel-phet @amyh-phet please give you opinions. I'm on the fence, but if nothing else can be done then I'd feel okay as is.

[ariel-phet]

Tested on iPad 2 iOS 9.3.2

On Suflur if sliders are moved at a moderate speed performance is reasonable

If going to extremes quickly there is a noticeable lag, but I don't think it wold be pedagogically damaging.

Assigning to @amyh-phet to make the final call. It seems to me in the normal use case scenario we are fine

[ariel-phet]

@amyh-phet please feel free to close if you deem acceptable.

If not, I will get an estimate as to what could be done to eek out more performance :)

[amyh-phet]

@ariel-phet When I looked at it on iPad 2 iOS 9.3.2, performance seemed reasonable to me as well. I agree there is a lag if adding large numbers of atoms quickly, but I don't anticipate this would be done in normal use.

Closing.