Graphs are undoubtedly the most effective way to communicate trend information, so Wormly provides them in abundance.
Consider, also, that absolute numbers often have little meaning in a performance context - one cannot objectively compare a 200ms response from one server with a 400ms response from another.
Instead, trend graphs allow you to understand your server performance in terms of its fluctuations over time. This gives you the information needed for capacity planning, as well as a better understanding of where bottlenecks lie.
A large variety of trend graphs are available, showing both internal and external performance metrics: