In the absence of other information, it's reasonable to assume linear scaling.
You haven't seen many charts, right?
Part of my training for a previous job was how to create presentations, including how to create charts to make numbers look good even if they aren't. To get an idea of some basic techniques, search for lie with charts. Some of the results:
Alexander
In reply to Re^7: Perl regex speed
by afoken
in thread Perl regex speed
by malaigo
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