Optimizing a large index can be very time-consuming and should be done, if at all, when index updates are infrequent.
优化大型索引可能会非常耗时，而且应该在索引更新不是很频繁的情况下才进行。
If it's used as a relatively infrequent part of the program's operation, the slow performance won't be a concern.
如果它作为程序运行中相对很少涉及的部分，缓慢的性能将不会是一个问题。
If the calls to this web service are infrequent (less than one a minute), it might be determined that there is no need for caching.
如果对这个Web服务的调用不多(每分钟少于一个)，那么可以确定没有必要进行高速缓存。
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