The more content you add to your website over time, the slower it will run. There are often a few causes for this common problem, but there’s a good chance that your site is slow because you’ve finally hit your shared hosting limits. In order to boost your site’s speed, it’s a good idea to upgrade from shared hosting to VPS hosting to decrease page loading times.
Be careful, though – there are some common traps many people fall into. Firstly, the promotional prices are only on offer for a month, after which you’re paying between $49.99 and $299.99/month on any of its five plans. Secondly, the 30 day, money-back guarantee is only valid for those who subscribe for a year or longer. Everyone else only has 48 hours to claim a refund.
Essentially, here’s the criteria I would use to judge things – if your site is made up of primarily static, HTML-based content, then you probably don’t need a VPS package.  However, if you have a large amount of files stored, multiple sites, dynamic content, and the possibility of major traffic from time to time, then you might consider upgrading to a VPS. It’s a powerful package that allows you to do more than you could with a shared hosting plan, but requires less investment than a dedicated server.
Let’s start with the difference between shared hosting and VPS hosting.