I am trying to import from iPhoto 9.6.1 into LR6 using the plugin built into LR6. The program identifies roughly 460GB of photos (55k+ photos). I have to select the output drive as a different drive because of the amount of data. The program works for about 10 minutes with the cpu pegged at 100% and then Lightroom 6 reports as not responding and I have to force quit. If I check the external drive, no data has been written. I even tried to do a fresh reformat of the external drive before transfer. Is there something I'm doing wrong?