去除CacheManagingDrawTask清除弹幕缓存等待30毫秒 #396
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绘制缓存的线程每次在清除已经过期的弹幕缓存时,没次清除一个都会等待30ms,如果量比较大,导致缓存线程阻塞,影响弹幕绘制效率。