To show the difference in running time between a routine which includes the option numeric versus one that does not include this option, we iterate over a non-trivial mathematical expression and check the elapsed CPU time.
SmallExample := proc ( )
local total;
option numeric;
total := 0;
for i from 1 to 10000 do
total := total * (mod (i, 50)) - log(i) + sqrt(i);
od;
return(total);
end: