I recently built a TAZ and I am using Ramps1.4. All works good, but the arcs show really rough segmentation and
the printer is running rough on arcs. Same firmware setting on a smaller prusa is very smooth.
What do I need to change. Any suggestions? Found this on adv.h

// Arc interpretation settings:
#define MM_PER_ARC_SEGMENT 1
#define N_ARC_CORRECTION 25

const int dropsegments=5; //everything with less than this number of steps will be ignored as move and joined with the next movement

AFAIK arc detection is not commonly used at the moment. The problem is most likely in your speed, acceleration, and jerk settings.

That is what I tried and yes, that is it. They used a very low acc 500 and xy jerk of 5, increasing to 1000 and 15 did the job. Thanks