I can tell what happened. The production site had multiple load-balanced web servers configured under a web farm (whereas, at staging site, there was only one web server) pointing to the same code base, and not each request was being routed to the same specific server. So, even if the first hit caused a server to perform an expensive query and load the data in its cache, subsequent requests were likely to be redirected to a different server, which didn't have the data in their cache and hence they were performing the same expensive operations to load the data and put it into their in-memory cache, which is already available in another server's memory.誰能幫我翻譯一下，真是看不懂什么意思