It works fine !
Thank you Mitch for the information !
And thanks spine team for binary supporting, too !

Pharan, thanks for your patient reply!
I just find out that the big lag occur in ReadSkeletonData() in SkeletonJson.cs
while deserializing json:

public SkeletonData ReadSkeletonData ( TextReader reader ) {
...
// Causing lag for larger file
var root = Json.Deserailize( reader ) as Dictionary<String, Object>;
...
}

I'll try do this stuff in background to solve problem.
Thank you!

I use asynchronous loading for spine datas. ( json, atlas, png ).
But when first time creating spine, it still cause lag in SkeletonRenderer LateUpdate().
One for about 250ms delay, 10 for 2.5 seconds delay.

Code snippets:

var obj = new GameObject();
var animation = obj.AddComponent<SkeletonAnimation>();
animation.skeletonDataAsset = asset;
// ... something else
// Big lag: Call SkeletonRenderer LateUpdate()
animation.Reset();   

Unity Version: 4.6.0f3

I have found that someone with the same question in this post:
http://esotericsoftware.com/forum/Unity-SkeletonRenderer-rebuilds-everything-each-frame-4466?p=21465&hilit=lateupdate#p21465

This problem has bothering me several months, is there a good solution yet? :think: :think: :think:
Thank you!