The performance difference between static and non-static methods is negligible, and I agree with posters on your previous question who stated that other concerns (readability of code, testability, etc) should be bigger factors in your decision.
Even in the realm of performance, many other factors (network access, SQL queries, algorithms) will become bottlenecks and deserve consideration more than the choice between a static or non-static method. I don't intend to be rude, but if you are concerned about application performance then you should be asking different questions.