With the work of Robert Ellenberg Look ahead has been greatly improved. Originally the TP could only look 1 segment ahead. This worked well for most machining operations - but large gcode programs made up of short line/arc segments run poorly. This page is comparing Linuxcnc's current TP (on segment look ahead) with the new TP (Robs work) and also some other machine controls.
The new TP allows you to set the number of segments it looks ahead. Most of the testing here had the TP set to 50 segment look ahead. Here is a great ongoing thread that shows how to test the new TP. [New TP thread]
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