wangzeyu Unfortunately, I cannot determine the cause from your explanation. Please see this page in the Spine User Guide for basic information about performance: http://esotericsoftware.com/spine-metrics
In general, the binary format is recommended because of its smaller file size and faster loading speed than the JSON format.
If you are not sure after reading the user guide, or if you would like us to check the cause of what is causing FPS drops, please send us your Spine project files via email: contact@esotericsoftware.com
Please briefly mention this forum thread URL in the email so that we know the context.
