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These variables control the verbosity of efficiency notes:
Before printing some efficiency notes, the compiler compares the
value of this variable to the difference in cost between the chosen
implementation and the best potential implementation. If the
difference is not greater than this limit, then no note is printed.
The units are implementation dependent; the initial value suppresses
notes about “trivial” inefficiencies. A value of 1 will
note any inefficiency.
When printing some efficiency notes, the compiler reports possible
efficient implementations. The initial value of 2 prevents
excessively long efficiency notes in the common case where there is
no type information, so all implementations are possible.