在Spine中，默认的时间轴帧率通常是30帧每秒，这意味着在Spine中创建的动画在Unity中播放时也会遵循这个帧率。你提到在更新到4.2版本后，播放速率变为30帧每秒，这可能是因为Spine的默认设置或Unity的项目设置影响了动画的播放速率。可以检查Spine的导出设置和Unity的项目设置，确保它们之间的一致性。此外，Spine的动画可以在任何帧率下播放，建议在Spine中使用播放视图（Playback view）来调整和查看动画的播放速度。

@shiningsoul It might be a problem with machine translation yielding an ambiguous result, but could you please show or describe in more detail which playback framerate you're talking about after importing in Unity? In general any exported animation timepoints are based on seconds, not frames. Apart from Physics Constraints, there should be no relevant fps for runtime playback.

@shiningsoul If you are talking about the generated Mecanim Clip assets FPS, these have no effect, see my answer on this thread here:
https://esotericsoftware.com/forum/d/28802-spine-unity-frame/2