My results : _Ptr:=GetMem(100000000) 18 mus, 824 ns / GetMem _Ptr:=GetMem(100000000) + FillChar(_Ptr^,100000000,0)); 81 ms / GetMem + FillChar
var ArInt:array of int32; . SetLength(ArInt, 100000000 shr 2); 81 ms / SetLength All timings are variable within [time, time+8%] on repeated runs as is generally the case for system timings. SetLength 0's (Internally calls FillChar) the array ArInt so to do a identical comparison you need to add the FillChar to the GetMem if it is your intention to 0 the array before using it. You have to compare things that do the same thing in the end. Tested on XP Pro Win32 Sp3 Intel Core 2CPU 6400 #@ 2.13GHz 2.05 GHr., 1.00 Gb RAM
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