Safari Performance Issue

After some investigations I realised that Spine animations with overlay blend mode performs really bad on safari and good on chrome. Also as I mentioned previously, semi transparent big textures (ex.darkening behind the popup which covers whole screen) they cause performance issue when they are on top of spine renderers. (I have lets say 30 spine objects and on top I have a layer with semi-dark transparent pixels and it drops the performance a lot. Removing spine objects or the layer fixes the issue) and this happens only on safari. I hope this info will help you more.

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This should be the issue relative to Safari itself, about its WebGL underlying implement. We have no clue of it. It seems like Safari have a higher underlying resolution which will hit the GPU pixel fill rate limit. So will lead to the problem when you use a lot of big Sprites piling on the screen.