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I am using Spine with Phaser 3. But I'm wondering about the memory issue:

  1. The Spine is not memory efficient.
  2. The Spine internally generates a code for animation in the respective language and execution time increases with sizable animation.

Can anyone help me on that?

This is not enough information to go by. What exact problem do you have? Can you give an example for "The Spine is not memory efficient"? I'm afraid I do not understand 2 at all.