You are not comparing apples to apples. You map loop assigns (copies) the entire array in addition to incrementing each element. If you drop the assignment, map beats foreach.

My results

foreach(@a){$_+=1;};

real    0m4.941s
user    0m1.096s
sys    0m3.604s

[download]
----------------------- 
@a = map{$_+= 1} @a;

real    0m6.248s
user    0m2.652s
sys    0m2.900s

[download]
------------------------ 
map{$_+= 1} @a;

real    0m3.224s
user    0m2.908s
sys    0m0.232s

[download]

Note: It is generally considered poor form to use map only for its side effects.

Updated to clean up and add note

Update 2:

More rigorous timing show that foreach is indeed faster --> Re^3: map vs for\foreach.

In reply to Re: map vs for\foreach. by sn1987a
in thread map vs for\foreach. by builat

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