I run my game in firefox, in most times the plugin-container in task manager takes 600M memory. But in few times it takes about 1G. When I use scout cc to test the game, I saw Other Players in The Other catagory takes about 400M. So I guess it cause the problem.
Other Players – if you're running the Flash Player plug-in in a web browser, this is the memory used by player instances other than the one you're profiling. This could be due to other content on the same page, or running in a different browser tab. The memory used by other ActionScript Workers also falls under this category.
Does mean if I have opened other tab, it may cause the problem? Any help will be appriciated.