I just did a simple v-carve using F-Engrave and it turned out well (V-Bit 90deg 12mm; 1h carving time in plywood):

Then, since I’m learning and experimenting, I figured, do a complex one of a celtic cross with lots of knot work, but now it is super slow, after several hours it is only up to 6%. Here is the path (or a bit of it) in Ground Control:

GCode looks like this:

G90

G20

G17 G64 P0.001 M3 S3000

F5.00

G0 Z0.2500

G0 X5.7170 Y12.7274

G1 Z-0.0000

G1 X5.7170 Y12.7274 Z-0.0000

G1 X5.7325 Y12.7030 Z-0.0270

G1 X5.7822 Y12.7107 Z-0.0278

G1 X5.8219 Y12.7136 Z-0.0285

G1 X5.8515 Y12.7129 Z-0.0306

G1 X5.8716 Y12.7077 Z-0.0361

G1 X5.8919 Y12.6966 Z-0.0474

G1 X5.9122 Y12.6796 Z-0.0647

G1 X5.9326 Y12.6567 Z-0.0878

G1 X5.9530 Y12.6279 Z-0.1169

G1 X5.9632 Y12.6214 Z-0.1235

G1 X6.0536 Y12.6214 Z-0.1247

G1 X6.1514 Y12.6189 Z-0.1277

G1 X6.1819 Y12.6377 Z-0.1086

G1 X6.2124 Y12.6512 Z-0.0948

G1 X6.2429 Y12.6593 Z-0.0863

G1 X6.2733 Y12.6621 Z-0.0832

G1 X6.5250 Y12.6599 Z-0.0827

G1 X7.0679 Y12.6469 Z-0.0818

G1 X7.4737 Y12.6401 Z-0.0791

G1 X7.9053 Y12.6357 Z-0.0767

G1 X8.2582 Y12.6339 Z-0.0743

G1 X8.9819 Y12.6329 Z-0.0718

G1 X9.2050 Y12.6292 Z-0.0745…

As you can see, it’s extremely detailed.

Any suggestions of what I might have done wrong?