而在并行呈现模式中，延迟时间应为所有单个延迟时间中的最大值。
In parallel rendering mode, the latency would be the maximum of all individual latency times.
如果涉及到很多后端系统，而每个后端系统在呈现单个页面时都会产生延迟，此时使用并行Portlet呈现就具有一定优势。
Parallel portlet rendering may be advantageous in cases where many backend systems are involved that each produce their own latency while rendering a single page.
多线程计算不仅用来实现细粒度的并行，合理的调度策略还有助于隐藏通信延迟。
Multithreads can not only implement fine-grain parallelism effectively, but also be helpful to hide communication latency with reasonable scheduling strategies.
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