这个计算考虑了缓冲池高速缓存的所有页(索引和数据)。

This calculation takes into account all of the pages (index and data) that are cached by the buffer pool.

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例如，如果您正在编写一个Web服务器，而且所有的高速缓存的页都存储在hashmap中，那么每个请求都将需要获得并占用那个map上的锁，这就将成为一个瓶颈。

For example, if you are writing a Web server, and all your cached pages are stored in a HashMap, every request will want to acquire and hold the lock on that map, and it will become a bottleneck.

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组件高速缓存提供了动态地创建web页面的一部分的能力，同时允许从高速缓存中获取其他的组件(在同一页面上)。

Component caching provides the ability to dynamically create part of a Web page while allowing other components (on the same page) to be fetched from the cache.

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