IIS on Windows 2019 slow

Uwe Gabbert 1 Reputation point


I have a big Server (CPU with 12 Kernel: used 5-10%; 192GB RAM: used 16GB, Ethernet 1 GB: Speed 500-1000 MBit/s, SSD).

But if I request a file over https (e.g. zip-File, MP4...) then the downloadspeed is round 7 MBit/s per User. If I the once User on my server, the Speed is never over 10 MBit/s.

MyClient has a Fibre-Connect with 450 MBit/s download. On other Clients it is the same.

What can I do?

Thanks. Uwe

Internet Information Services
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  1. Sam Wu-MSFT 7,046 Reputation points Microsoft Vendor

    Hi @Uwe Gabbert

    You can try the following settings:

    • Edit the request filtering feature settings and the request limits using IIS manager Open IIS manager -> now select the website that should be configured -> do a confirmation check that you are in the features view that can be found on the bottom of the IIS manager -> click on the option request filtering and double click on the icon -> you will see a request filtering pane displaying on the screen -> click on "edit feature settings" that can be found on the right side of the screen in the pane displayed -> the "Edit request filtering settings" window will open on the screen -> in the section called "Request limits" enter the maxAllowedContentLength=4,294,967,295 -> then click on OK option -> restarting the IIS.
    • You can increase the maximum file size by modify the maxAllowedContentLength setting in the web.config file: <requestFiltering>
      <requestLimits maxAllowedContentLength="2147483648" />

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  2. Uwe Gabbert 1 Reputation point

    It dosn't change everything.