The simple answer is – a lot. With 10 concurrent web processes and 1 GB of memory you can have 15 PHP pages being loaded each using up to 100 MB of memory! Those processes will run extremely fast allowing for hundreds of concurrent viewers. For example, a modern WordPress site using a fast theme with minimal plugins, like our site, uses about 50 MB to render each page. Using WordPress plugins like UsageDD provide you with an easy way to see your per page memory usage statistics.