It is quite difficult to define โnormal memory usageโ for anything without a more complete specification.
For example, if you store a large amount of data in memory, this will affect the "normal memory usage" of your application. One thing that can especially skew this is that data is cached in response to user action. A scenario may arise that users launch on one of the thousands of visits to your site, which forces you to cache 75 MB of additional data, which can (depending on the regular data set) cause a significant difference.
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