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Old Sep 27, 2011, 07:08 PM   #1
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Join Date: Jul 2002
Location: Boardman, Ohio
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QTKitServer (Quick Look Helper) Service Eating Bandwidth

I was experiencing some serious network latency issues from my iMac to a networked Mac mini and a FireWire 800 connected storage array tonight and discovered something very shocking.

It appears that if you have a window open containing a QuickTime-compatible video library, Lion wants to cache a portion (or possibly the whole file) for quick access using Quick Look. This becomes problematic when you have a large video library and even more problematic when the library is on a network share.

My LAN utilization skyrockets to 100% of its capability (100BaseT) and stays there for at least 45 minutes, possibly longer. I closed the window before I could see if it would stop or keep on cycling. As soon as the window is closed, the QTKitServer process and the network bandwidth drops to normal levels.

I recently switched from a Netgear gateway to a more powerful pfSense setup because the Netgear kept flaking out on me. With all this traffic, I now know why.

Is anyone else able to duplicate this problem with Snow Leopard? All you need is a folder full of video content on a network share, in a format that can be previewed with Quick Look (m4v, mp4, etc). Set the folder to list view and sit back and watch your network traffic in Activity Monitor.
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Old Feb 1, 2013, 06:16 PM   #2
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Join Date: Sep 2011
Location: Shrewsbury, UK
Hey you didn't manage to come up with a way to get around this did you?
I have moved allot of my old videos etc to cloud storage and have my iMac mount its FTP connection as a drive at log in, when i open the folder all of my downward bandwidth gets eaten up for about 10 minutes usually.
I understand its going to use some bandwidth to download whats in the folders but even after the bandwidth is free again i can click on a folder and it will use huge amounts of bandwidth loading that folder up.
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