Hi there, I'm looking into Spine Pro to see if it could fit my game's needs and I have some questions.

Some context: this is the runtime that I would use: https://github.com/pixijs/spine, and my game is a browser-based (using Pixi JS), 2D, 4-directional MMORPG, that uses PNG Spritesheets for all animations.

The characters and NPCs have a pretty low framerate (less than 15 FPS) because that's the style of the game. Whereas all the examples of games using Spine -that I've seen- have a very smooth high framerate (more than 60 FPS).

Here are a couple of images with descriptions to clarify what I mean: https://imgur.com/a/1t6BTJQ

All of Spine's examples have a very high framerate (60 FPS or more): http://esotericsoftware.com/spine-demos, which are very different from the NPC animation in my imgur link, because it has at most 15 FPS and that's what I'm trying to achieve.

Some people told me that it's impossible because Spine does frame interpolation, so it can't pick out 15 frames out of the whole interpolation and play that (don't know if this is true). Some other people told me that it is actually possible to play everything at 15 FPS at runtime but under the hood it will still be "computing" the animation as if it had 60 FPS. In other words, the user sees the animation at 15 FPS like I want - but they would still suffer the same performance hit as a 60 FPS animation. Of course this wouldn't be ideal since in my game there a lots of characters and NPCs in the screen at all times - this could be a big performance hit to any computer, as you can see here:

I think the Spine Boy in that video is running at least on 60 FPS, and what I'm supposing is that if somehow you could run it on 15 FPS instead, the performance hit would be lessened by a lot. Anyway, if something is not clear let me know. Thanks in advance!
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Spine is not limited to any frame rate. Most parts of Spine animations are interpolated (everything except attachment changes and events). When an animation is applied, the skeleton is posed at that time. You can increment the animation time with any amount of precision you like. Most games let the animation be applied based on the wall time elapsed between screen draws. This makes the animation smooth at any frame rate. You can also increment the animation time less often to achieve a lower frame rate. For example:
Changing refresh rate at runtime to mimic No Interpolation
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