300-350km/h actually. Although most places indeed average 200-250 on high speed lines, for example in Germany because those services often share infrastructure with slower trains. In France and Spain, however, infrastructure is often exclusively high speed which allows much higher sustained speeds around the 300km/h mark.
Of course the software is a problem, but its hardware is the same as an iPhone 4. It has 256MB working memory. Most browsers take up that kind of ram four-fold to just have a window open. Although I do agree that any and all devices should have the freedom to run whatever software you want, even Linux would be having a hard time on a 800mhz processor with so little ram for anything other than basic terminal work.
Nice job ignoring the very real possibility that your computer has been part of a botnet for years. The botnet thanks you for your service.