-e: the plugin process/child of the browser stays on max cpu and the game becomes very sluggish

-repro so far: win7/10.8.5 with chrome & FF (& IE11)
-starts with 4.5 beta1

-repro:
--install current plugin
--run http://www.kongregate.com/games/tinyBuild/no-time-to-explain-demo
--open task manager
--notice process uses below max cup/core power and game is very snappy
--switch to beta channel (currently has 4.5b5 runtime) and reload game
--NOTICE game is very sluggish and core is maxed out