Whenever an application is executed on a web server, it is loaded into the physical memory. If you run a resource-demanding script, or if you just add more scripts on your websites and you get plenty of visitors, you may encounter a situation where your VPS has not enough memory to run all the applications and freezes as a result, which means that your sites shall stop functioning properly and that the site visitors shall start seeing error messages. To avoid such a scenario, you could take advantage of the RAM upgrade that we are offering and increase the amount of physical memory at your disposal without changing the whole plan. That way, you can pay only for the resources you actually need rather than for additional disk space or higher Processor speeds that you won't really use, for example. With the upgrade, you could ensure the flawless performance of your websites, which also means a better experience for your website visitors.