Performance issue about changing UIAtlas at runtime

[terrynoya]

HI All,
 I'm making an 2d action game, Characters have many actions that can't pack in one sheet,so I seperate actions (walk,move,attack,jump) like this.Then when I add 50 or more characters on my stage, and let them change uiatlas at the same time,let them attack(for 50 sprites, each call sprite.atlas = moveAtlas),then fps drop down drastically.
 Is there any idea or better way to solve this problem?
 Sorry for my English and Thank you.

[hrlarsen]

just my five, but wouldn't it be idealy to use the Unity 2D system to create a game?

[terrynoya]

just my five, but wouldn't it be idealy to use the Unity 2D system to create a game?

Very Sorry,My Fault, At last I found the cause was I Debug.log at that frame.
Change uiatlas will not effect fps and work perfectly
Thank you!