As I don’t develop C# application at work anymore, I was finally allowed to switch from Windows to Linux. So I grabbed the 64-bit version of Mint Debian Xfce, installed it and moved my Thunderbird profile and my Python projects. After installing new Python virtual environment I launched the tests for our biggest project using Twisted. Tests passed, but it seemed to me that they run way too long. So I launched Windows once again and compared the time. Under Windows XP tests run for about 40 seconds and under Linux – for over 200 seconds. So I wondered how the hell was this possible, Linux can’t be 5 times slower than Windows.