Почему ToUpper быстрее, чем ToLower? ⇐ C#

[Anonymous]

Stopwatch stopwatch1 = new Stopwatch();
Stopwatch stopwatch2 = new Stopwatch();
string l = "my test";
string u = "MY TEST";

for (int i = 0; i < 25; i++)
{
l += l;
u += u;
}

stopwatch1.Start();
l=l.ToUpper();
stopwatch1.Stop();

stopwatch2.Start();
u=u.ToLower();
stopwatch2.Stop();

// Write result.
Console.WriteLine("Time elapsed: \nUPPER : {0}\n LOWER : {1}",
stopwatch1.Elapsed, stopwatch2.Elapsed);


Я бегал много раз:

UPPER : 00:00:01.3386287
LOWER : 00:00:01.4546552

UPPER : 00:00:01.1614189
LOWER : 00:00:01.1970368

UPPER : 00:00:01.2697430
LOWER : 00:00:01.3460950

UPPER : 00:00:01.2256813
LOWER : 00:00:01.3075738


Подробнее здесь: https://stackoverflow.com/questions/412 ... an-tolower