OSAI - 2s Pause After Z rapids

Whenever I make a rapid Z moves, my CNC (NewCNC SMART ER II) pauses for ~2 seconds. Here's a sample drilling operation:

Code:

---

G00 X1 Y1 Z1
G01 Z0 F100
G00 Z1
(~2 second pause here)
G00 X2
G01 Z0 F100
G00 Z1
(~2 second pause here)
....

---

I've probably read the manual 5x trying to figure out what could be causing this. Manual here. It doesn't happen during canned drilling cycles (or even X/Y rapids), but I can't rely of those because it doesn't help me for milling operations.

I primarily drill, countersink, and cut out hundreds of shapes from 4x8 sheets with upwards of 1,000 of these Z rapids in the program, so that's 30 minutes in pauses alone per sheet. Ouch!

Any ideas?