USCIS applies rate limit on API call. It delays the crawler. I'm trying to find a workaround.
IOE Case Stats
IOE N-400
IOE I-765
IOE I-90
IOE I-821
IOE I-130
IOE I-485
IOE I-131
IOE I-290B
IOE N-600
IOE I-751
IOE I-140
IOE I-129
IOE I-526
IOE I-539
IOE I-134A
IOE I-134