Whenever an app is executed on a server, it is loaded into the physical memory. If you run a resource-demanding script, or if you simply add more scripts on your sites and you get loads of visitors, you could encounter a scenario where your VPS has insufficient memory to run all the applications and freezes for that reason, which means that your Internet sites shall stop working properly and that the visitors will start seeing error messages. To avoid this kind of a scenario, you may take advantage of the RAM upgrade that we're offering and increase the amount of physical memory for your use without changing the entire plan. This way, you may pay only for the system resources you actually need rather than for additional disk space or higher Processor speeds that you will not really use, for instance. With the upgrade, you'll be able to guarantee the flawless functioning of your websites, which also means a better experience for your visitors.