A simple Lagbar that you can move around. It will show you your current FPS and the current Latency (or Lag) that you are experiencing. (Supports world/realm ping as well)

NOTE: This isNOT a Databroker (LibDataBroker) addon. It provides it's own frames and remembers positioning.

To Unlock/Lock the frame just right-click it using your mouse.

LagBar:
/lagbar reset - resets the frame position
/lagbar bg - toggles the background on/off
/lagbar worldping - toggles world ping display on/off

You can view Alpha Builds at my Github tracker.

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I'm sorry but there are just way too many addon websites to keep track of. Instead of checking each one, I use the GIT repo to distribute the updates through the web. I've disabled comments here because I want everything to be in one central location.

TO POST COMMENTS OR BUGS, USE THE LINK BELOW:
http://www.wowinterface.com/downloads/info12373-LagBar.html

OR use GitHub to report bugs. Github tracker.