如果某个特定的缓存太小，则WebSphere Portal服务器会太频繁地访问数据库，从而导致性能下降。
If a particular cache is too small, then the WebSphere Portal server can go to the database too often, which can result in performance degradation.
API调用常常很繁琐：繁琐的客户端指的是为了完成一次功能需要发出多次HTTP请求，从而导致严重的性能下降及网络超载。
API requests are often chatty. Executing a chatty client, one making multiple HTTP calls, usually leads to both significant performance degradation and network over utilization.
由于在线分析仪表不仅价格昂贵，而且分析仪表滞后大，最终将导致控制系统的性能下降，从而难以满足生产要求。
On-line analysis instruments have several disadvantages including costly price, great lag etc., which lead to descend of control system's performance and can't meet production requirements.
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