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I've heard that phrase a lot. What does it mean?
An example would help.
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terminology
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I think the phrase is generally used to designate a loop which iterates many times, and which can have a serious effect on the program's performance - that is, it can use a lot of CPU cycles. Usually you would hear this phrase in a discussion of optimization.
For examples, I think of gaming, where a loop might need to process every pixel on the screen, or scientific app, where a loop is processing entries in giant arrays of data points.