When cutting arcs or circles using the rotary. Lightburn produces G-code that slows the speed to a crawl proportionally depending on the amount of A axis movement vs X axis. I’ll post the gcode at the end. It does not exhibit this behavior when cutting rectangles or straight lines. Basically it ends up over melting the ends of my holes I am trying to cut.

Lightburn is current and this is a custom machine using GRBL-LPC.

Gcode below

; LightBurn 0.9.14

; GRBL-LPC device profile, current position

; Bounds: X0 Y0 to X40 Y76

G00 G17 G40 G21 G54

G91

M4

; Cut @ 25 mm/sec, 80% power

M8

G0X10.47A10.346

G1X-.84A2.064S800F1014.4

X-.81A2.229F950.9

X-.79A2.39F896.6

X-.75A2.545F830.4

X-.73A2.694F782.3

X-.69A2.838F721.3

X-.66A2.977F670.9

X-.63A3.11F623.4

X-.6A3.239F578.3

X-.55A3.36F519.6

X-.52A3.478F479.4

X-.49A3.59F441.4

X-.44A3.696F389

X-.4A3.797F346.8

X-.36A3.892F306.4

X-.31A3.983F259.4

X-.27A4.068F222.1

X-.22A4.147F178.2

X-.18A4.221F143.6

X-.13A4.29F102.3

X-.07A4.353F54.4

X-.03A4.411F23

X.03A4.411

X.07A4.353F54.4

X.13A4.29F102.3

X.18A4.221F143.6

X.22A4.147F178.2

X.27A4.068F222.1

X.31A3.983F259.4

X.36A3.892F306.4

X.4A3.797F346.8

X.44A3.696F389

X.49A3.59F441.4

X.52A3.478F479.4

X.55A3.361F519.4

X.6A3.238F578.5

X.63A3.11F623.4

X.66A2.977F670.9

X.69A2.838F721.3

X.73A2.694F782.3

X.75A2.545F830.4

X.79A2.39F896.6

X.81A2.229F950.9

X.84A2.064F1014.4

X.86A1.893F1073.6

X.89A1.717F1140

X.9A1.535F1196.5

X.93A1.347F1262.2

X.95A1.156F1320.2

X.97A.957F1374.3

X.98A.754F1419.7

X1.01A.545F1458.8

X1.01A.331F1484.4

X1.03A.111F1498.3

X1.03A-.111

X1.01A-.331F1484.4

X1.01A-.546F1458.7

X.98A-.753F1419.9

X.97A-.957F1374.3

X.95A-1.156F1320.2

X.93A-1.347F1262.2

X.9A-1.535F1196.5

X.89A-1.717F1140

X.86A-1.893F1073.6

X.84A-2.064F1014.4

X.81A-2.229F950.9

X.79A-2.39F896.6

X.75A-2.545F830.4

X.73A-2.694F782.3

X.69A-2.838F721.3

X.66A-2.977F670.9

X.63A-3.11F623.4

X.6A-3.238F578.5

X.55A-3.361F519.4

X.52A-3.478F479.4

X.49A-3.59F441.4

X.44A-3.696F389

X.4A-3.797F346.8

X.36A-3.892F306.4

X.31A-3.983F259.4

X.27A-4.068F222.1

X.22A-4.147F178.2

X.18A-4.221F143.6

X.13A-4.29F102.3

X.07A-4.353F54.4

X.03A-4.411F23

X-.03A-4.411

X-.07A-4.353F54.4

X-.13A-4.29F102.3

X-.18A-4.221F143.6

X-.22A-4.147F178.2

X-.27A-4.068F222.1

X-.31A-3.983F259.4

X-.36A-3.892F306.4

X-.4A-3.797F346.8

X-.44A-3.696F389

X-.49A-3.59F441.4

X-.52A-3.478F479.4

X-.55A-3.36F519.6

X-.6A-3.239F578.3

X-.63A-3.11F623.4

X-.66A-2.977F670.9

X-.69A-2.838F721.3

X-.73A-2.694F782.3

X-.75A-2.545F830.4

X-.79A-2.39F896.6

X-.81A-2.229F950.9

X-.84A-2.064F1014.4

X-.86A-1.893F1073.6

X-.89A-1.717F1140

X-.9A-1.535F1196.5

X-.93A-1.347F1262.2

X-.95A-1.155F1320.4

X-.97A-.958F1374.1

X-.98A-.753F1419.9

X-1.01A-.545F1458.8

X-1.01A-.331F1484.4

X-1.03A-.112F1498.3

X-1.03A.112

X-1.01A.331F1484.4

X-1.01A.545F1458.8

X-.98A.753F1419.9

X-.97A.958F1374.1

X-.95A1.155F1320.4

X-.93A1.347F1262.2

X-.9A1.535F1196.5

X-.89A1.717F1140

X-.86A1.893F1073.6

M9

G1S0

M5

; return to starting pos

G0 X-10.47A-10.35

M2