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We are using SP 2010 with EBS (external blob storage http://msdn.microsoft.com/en-us/library/bb802812(v=office.14).aspx).

The problem: When a user tries to download some large attachments (100MB) from a SharePoint list item, the CPU usage runs high and a restart of the w3wp process is needed. How can we solve the problem?

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Are you using a 3rd party provider or did you create your own? –  Jesus Shelby Jun 26 '13 at 1:09
Also, what does your farm topology look like? Maybe your current setup is too weak to be hosting 100mb files. –  Mike Nov 10 '13 at 16:35
Did you checked if you Antivirus isn't causing this? –  C. Marius - MVP yesterday
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