I hope this is the right place for this post. I was exporting a video on Final Cut Pro X on my rMBP, and the 7 minute video took just under a minute to export at 720p, 24fps. After exporting, I plugged in an external (portable) hard drive to transfer some file, and after it finished, I didn't eject it, and just let it sit there. Then I realized that I had to make a small change to the video (moving a clip), so I did that and exported again, but this time, it was taking about 10 minutes to export. I wasn't sure what the issue was, and I checked Activity Monitor and there wasn't any other process that was hogging the CPU. During the 10-minute long export, I ejected the external, and it instantly sped up and finished in less than a minute. I guess it's not much of an issue as I know now to eject things before exporting, but is this a normal issue? Thanks.