Fiddler RAM usage

3 posts, 0 answers
  1. Igor
    Igor avatar
    1 posts
    Member since:
    Aug 2015

    Posted 14 Aug 2015 Link to this post

    If you leave Fiddler running for some time, it sooner or later run out of memory. Look at the attached picture. Fiddler uses more than 4 GB RAM!

    Is there any fix for this issue available?

  2. Eric Lawrence
    Eric Lawrence avatar
    832 posts

    Posted 14 Aug 2015 Link to this post

    Unfortunately, your image didn't seem to make it.

    Fiddler uses as much memory as it needs to hold the traffic it displays; if you want Fiddler to lower its memory usage, you should remove Sessions from the Web Sessions list. One approach for doing so is to use the "Keep Only" option on Fiddler's toolbar to limit the number of Sessions kept.

    See for discussion.

    Note that running the latest build of Fiddler (4.6) on the latest .NET Framework (v4.6) can decrease memory usage vs. running older versions.

    Eric Lawrence
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  3. Stephen
    Stephen avatar
    1 posts
    Member since:
    Sep 2017

    Posted 02 Sep 2017 Link to this post

    Note that the documentation linked from the previous comment suggests a setting on the Filters tab that no longer exists. As Eric suggested, you want to go to where it says "Keep: All sessions" on your toolbar, and change that to a lower number.

    The linked documentation also says, "If you're on a 64-bit machine, you'll never hit a problem." but of course this isn't really true. You can still run out of memory, it just won't be due to the limits of a 32-bit architecture.

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