Odd, I have used it in solutions with dozens of project, hundreds of code files and ten's of thousands of lines of code and never experienced an issue. I will admit when you first open it in large solutions it takes a little bit for it to cache what it needs. Of course I have had problems with other products that everyone else claimed was fine so to each their own I suppose. Do you have a tool you use in place of ReSharper to solve it's niche?