I've added the following:
ModPagespeed on
ModPagespeedEnableFilters insert_image_dimensions
However, my image still appears as follows:
No width has been inserted here.
(Page URL https://www.medexpress.co.uk/journals/readme.html)
Answer
It looks like image dimensions are not being inserted because mod_pagespeed is unable to fetch your images. mod_pagespeed must be able to fetch the image in order to know how large they are to be able to insert the correct dimensions. There are a number of reasons that fetching can fail. See the bullet list at the bottom of this FAQ for some of the most common reasons.
The best solution to the problem though, if your environment allows it, is to enable ModPagespeedLoadFromFile. This allows mod_pagespeed to fetch files directly from disk, instead of over HTTP, which can increase reliability and performance.
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