System Load Indicator (or Indicator-Multiload) is, as its name says, an appindicator that exposes your system load (CPU and Memory usage, Download/Upload speeds, etc) by simply clicking it (starting with this 0.2 release).
This new version brings a menu filled with system values to previously charts-only System Load Indicator.
Launch System Load Indicator 0.2 via the Dash ("Autostart" is enabled by default, but you need to launch it on its first time usage).