This is a simple cast bar with class colors and GCD and latency tracking.
It also truncates long spell names that would otherwise overlap with the progress text.
Hides the default Blizzard cast bar. The current position is very close to that one. Move the group when changing position.
Note: Latency is different than world lag. Sometimes the server can take forever to respond, but the problem is not at your end. World lag is not reflected in the cast bar.