inline_preview_images changed behaviour in 1.5.27.2?

[theartofweb]

ref: http://www.simnet.net.au/

The larger banner photo is no longer being inlined.

ref: http://www.simnet.net.au/read/2755/more-health-professions-train-at-revamped.html

ref: http://www.simnet.net.au/read/2639/call-for-abstracts-open-for-simulation.html

These smaller photos are still being inlined.

Settings:

    ModPagespeedEnableFilters prioritize_critical_css

    ModPagespeedEnableFilters inline_preview_images

    ModPagespeedMinImageSizeLowResolutionBytes 5120

[Matt Atterbury]

Hi,

It looks to me like the default max size for inlined images is 2kb and these are bigger than that.

It's possible that we (incorrectly) ignored that limit for lazyload_images previously, but I expect that if you set it higher they will be inlined:

ModPagespeedImageInlineMaxBytes 4096

cheers, m.

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[theartofweb]

Sorry, but I was referring to "inline_preview_images" and not "inline_images" which we don't use.

AFAIK the former has only a 'Min' cutoff setting while the latter only has a 'Max' value which defaults the 2kb, but in the current beta release it looks as through there might also be a 'Max' cutoff for "inline_preview_images"?

[Matt Atterbury]

Ah, my bad. I can't see an obvious reason why it's not inlining them - it looks like it should.

[Jud Porter]

I don't have a final answer for you yet, but a couple things I've observed.

First off, the main banner looks like it has one of a few random images on it. Unfortunately, our current solution for detecting critical images doesn't deal well with this case. The behavior I am seeing is that one of the images gets identified as critical. Then on a reload, a different image will be displayed and mod_pagespeed will not correctly identify it as critical. For example, if I visit www.simnet.net.au/?ModPagespeedFilters=inline_preview_images and refresh several times, I do see one of the 8 or so banner images consistently being inlined.

However, it also appears that there is something else going on that is preventing any images from being inlined by default. If I refresh the main page several times, I don't see any images being inlined. Further, if I view http://www.simnet.net.au/?ModPagespeedFilters=+inline_preview_images I don't get any inlined images, where as with just ModPagespeedFilters=inline_preview_images (without the +) I do. I'm worried there is a filter interaction issue here. Do you have any other filters besides prioritize_critical_css and inline_preview_images enabled?

Thanks,

Jud

[theartofweb]

I can confirm that the random banner is the problem.  After flushing the cache and then displaying only the same photo every time that banner was consistently inline_previewed.  In the previous betas all of the photos were inline_previewed so that is new behaviour.

The other images are being skipped because we set the lower cutoff to 5kb for inline_preview_images.