pagespeed not shrinking images properly

[agnana...@gmail.com]

Hi Team,

  I'm new to pagespeed. I've configured pagespeed for my organization wordpress website and its working fine. But some of the images are still required to optimize as reported by pagespeed insights. But when I check the same images in mod_pagespeed_message, it was shrink already. Kindly help me on this.

The configuration is 

ModPagespeedEnableFilters combine_css

        ModPagespeedEnableFilters outline_css

        ModPagespeedEnableFilters extend_cache

        ModPagespeedEnableFilters rewrite_images

        ModPagespeedEnableFilters rewrite_css

        ModPagespeedEnableFilters rewrite_javascript

        ModPagespeedEnableFilters move_css_to_head

        ModPagespeedEnableFilters move_css_above_scripts

        ModPagespeedEnableFilters remove_comments

        ModPagespeedEnableFilters collapse_whitespace

        ModPagespeedEnableFilters combine_javascript

        ModPagespeedEnableFilters convert_jpeg_to_webp

        ModPagespeedEnableFilters inline_import_to_link

        ModPagespeedEnableFilters flatten_css_imports

        ModPagespeedEnableFilters prioritize_critical_css

        ModPagespeedEnableFilters sprite_images

        ModPagespeedEnableFilters lazyload_images

        ModPagespeedEnableFilters inline_images

        ModPagespeedEnableFilters move_css_above_scripts

        ModPagespeedEnableFilters resize_images

        ModPagespeedEnableFilters recompress_png

        ModPagespeedEnableFilters recompress_jpeg

        ModPagespeedEnableFilters defer_javascript

        ModPagespeedEnableFilters inline_css

        ModPagespeedEnableFilters convert_png_to_jpeg

        ModPagespeedEnableFilters fallback_rewrite_css_urls

pagespeed_message for images:

[Tue Oct 17 00:02:43 2017] [Info] [22300] https://mysite.com/:462: Shrinking image `https://mysite.com/wp-content/uploads/2017/08/mysite-logistics-transportation-shipping.jpg' (318944 bytes) to `https://mysite.com/wp-content/uploads/2017/08/xmysite-logistics-transportation-shipping.jpg.pagespeed.ic.icDkTGlXdW.jpg' (312357 bytes)
[Tue Oct 17 00:02:44 2017] [Info] [22300] https://mysite.com/:501: Shrinking image `https://mysite.com/wp-content/uploads/2017/08/mysite-shipping-logistics.jpg' (431430 bytes) to `https://mysite.com/wp-content/uploads/2017/08/xmysite-shipping-logistics.jpg.pagespeed.ic.ntdLH8_3Z3.jpg' (425870 bytes)

pagespeed insight report:

Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 199.8KiB (19% reduction).
Compressing https://mysite.com/…ted-shipping-network-map-matson-2017.jpg could save 74.9KiB (28% reduction).
Compressing https://mysite.com/…shipping.jpg.pagespeed.ic.icDkTGlXdW.jpg could save 65KiB (22% reduction).
Compressing https://mysite.com/…ogistics.jpg.pagespeed.ic.ntdLH8_3Z3.jpg could save 49.5KiB (12% reduction).
Compressing https://mysite.com/…-content/uploads/2017/06/matson_ship.jpg could save 6.3KiB (11% reduction).
Compressing https://mysite.com/…_packing.jpg.pagespeed.ic.9vLPR9Vklx.jpg could save 4KiB (14% reduction).

[Joshua Marantz]

One thing we've seen is that PSI expects you to resize your images on the server to their rendered dimensions. This is not always possible depending on your css.  

mod_pagespeed actually supports this (doc), but if your CSS sizes images proportional to window size it will not work, and this feature is not on by default.

Check your site with webpagetest.org for another metric on proper image sizing.

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