AnsiString manipulation extremelly slow (D2009)

// ansistring test
 
Var a: ansistring;
    b: integer;
 
 PerfTimerInit;
 for b:= 0 to 50000 do
  a:= a+chr(random(256));
 caption:= inttostr(PerfTimerStop);
 // 3977 ms
 
 
 
 
// string test
 
Var a: string;
    b: integer;
 
 PerfTimerInit;
 for b:= 0 to 50000 do
  a:= a+chr(random(256));
 caption:= inttostr(PerfTimerStop);
 // 2ms
 
 
 
 
 
Uses Windows;
 
    procedure PerfTimerInit;
    function PerfTimerStop: Integer;
 
Var     PF, PC0, PC1: Int64;
 
implementation
 
procedure PerfTimerInit;
begin
   QueryPerformanceFrequency(PF);
   QueryPerformanceCounter(PC0);
end;
 
function PerfTimerStop: Integer;
begin
    QueryPerformanceCounter(PC1);
    Result:= ((PC1-PC0)*1000) div PF
end;

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