It always starts with a phone call from an irate customer. You're given a program that instead of running, crawls. You check the usual suspects: file IO, database access, even Web service calls: all this, to no avail. You use your favorite profiling tool, which tells you that the culprit is a tiny little function that writes a long list of strings to a text file. You improve this function by concatenating all the strings into a long one and writing it all in a single operation, instead of hundreds or thousands of writes of a few bytes each.


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