I am currently using bluevm VPS 128mb ram for 7.50$ an year. They are very cheap. But sometimes if many users open my site simultaneously then my website loads slow. I think its because of ram.So i am thinking to upgrade to 256mb ram. But i want to know is it really because of ram.If i upgrade to 256mb ram then it will solve the problem? shared hosting is not for me.please dont recommend it. Please share your opinion.