The folks updating our site oft complained about the media browser being very slow, so I went to have a look.

And, on the first load of the page, and when doing a search within the media browser, its taking a while to download each of the image previews, even longer than it should on our shonky office broadband.

So, I inspected the source of the page, and it became clear. Each image thumbnail is actually linking to the full size image, and resizing it in HTML, see:

enter image description here

Is this an issue anyone's aware of? Is there a workaround? I'd presume there should be a built in thumbnail type for that purpose.

  • 2
    Mabye my workaround here can help you?
    – birgire
    Sep 17, 2015 at 13:20
  • This isn't happening on my site
    – Tom J Nowell
    Sep 17, 2015 at 14:00
  • 2
    It should use the medium size - either you've disabled this size, or the image was too large to resize in the first place (not enough memory). Sep 17, 2015 at 15:42
  • @birgire your workaround worked perfectly to sort this out, it now uses a custom image size in replacement of the medium size.
    – gravy
    Sep 18, 2015 at 7:08
  • 1
    @gravy glad to hear it worked for you.
    – birgire
    Sep 18, 2015 at 7:48

1 Answer 1


As per the comments, my theme was missing the system default medium image size.

Applying @birgire's workaround to make the system use a custom size did the trick.

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