This process is commonly referred to as failover and occurs on subsequent requests.
此过程用于处理后续请求，通常称为故障转移。
PHP objects and variables can be stored in the user cache and then re-used on subsequent requests.
PHP对象和变量可以存储在用户缓存，然后再在后续请求。
A user tells you that the first time they come to your web page each day, the page loads slowly, but on subsequent requests it is fast.
一个用户告诉你每天在首次访问你的网站时，网页加载都很慢，但接下来的操作都很快。
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