If you are seeing a drop in performance when loading your playable in Safari, it is likely due to the fact that Safari has on average a lower performance rate than other browsers like Google Chrome.
This is due in part to reasons such as Safari having a less optimal JS array iteration.
- Optimise your playable further: E.g. reduce the amount of keyframes to no more than 10 per animation, reduce the vertex count on blendshapes to be as low as possible. Click here for more tips on optimisation.