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这个是CDN服务器的特性,一般来说,任何CDN服务器都需要从中央服务器获取数据,然后建立他们本地的缓存,如果某个CDN节点从未接受过某个文件的请求,他的首次下载速度会比较慢。如果游戏被下载的比较多,速度自然快,而额外内容 可能下载量不大。