Guys would you say that having installed VS 2008 and VS 2010 on one machine would the latter work slower than the former? Because when I work with VS 2010 I can't get the feeling of that it is slower than the VS 2008.
Yes VS2010 IS (clearly) slower. Its really noticeable in a virtual machine (when coding under Linux, using VMWare). If your PC won't run it, you should upgrade it (cpu is the key word here) or use VS2008.
(Or replace your development tool with an alternative IDE. For example Netbeans for cpp, (or qtcreator), sharpdevelop for C#...don't know what you code there.. but guess the alternative would be a new question already.)