Website power resource is comprised of 5 elements. CPU, RAM, IO, Entry Processes, and Number of Processes. Each plan increases each of these elements as you get a bigger plan. For example; the Easy Plan has a very limited power resource because the price is too low to have a large amount of these sites on a server without it. All plan limits are set to provide the lowest price while still being able to cover the total server costs. Web Host Pro is known as one of the fastest web hosts and has been awarded as the fastest web host year after year. For us to maintain this high level of web hosting quality we have to keep track of the server use.
The Pro Plan has enough power to run over 80% of the Internet's websites. It has a full basic servers worth of power available. It is still limited, but only if the server as a whole needs more power to run it's best.
The Advanced Plan uses servers with no limitation software on them. Essentially running the same power as a dedicated server.
For the more technical, here is the specs for each plan:
Basic Plan : 2gb RAM - 25% CPU - 25 entry processes - 100 concurrent connections - 1024 IO speed.
Pro Plan : 8gb RAM - 100% CPU - 200 entry processes - 500 concurrent connections - 2024 IO speed.
Advanced Plan : 24gb RAM - Unlimited CPU - Unlimited entry processes - Unlimited concurrent connection - Unlimited IO speed.