Flash Webgame run slowly in latest flashplayer on Chrome

Operating system version : Windows 7

Web browser and version: Google Chrome  49.0.2623.87

Flash Player version:21.0.0.182

We've built a flash game on web platform ,and it run just normal before March 10 .From then on, a lot of people complain about the poor frame rending,it became slow and never goes well.I wish any stuff could take a look at the game of the url below.Comparing to a chrome browser installing flashplayer with earlier version (for instance,FlashPlayer 20),a chrome whose FlashPlayer version is 21.0.0.182 present this game with lag.Just running around,pressing the key"A" for autofight and click the fly icon (you are supposed to click all these different fly icon).

URL:

http://op2.179.com/s1‌

Account:    w1976372368

password:  qq15995039193

Thanks.