jmarantz commented on issue #2085:
URL:
https://github.com/apache/incubator-pagespeed-mod/issues/2085#issuecomment-954742259
One other subtlety around this: there are few caches in the path,
potentially that may need to be warmed by retrying a few times.
* mod_pagespeed's server-side cache: the first time an image is requested,
it will likely be returned unoptimized while it optimizes in the background
* browser-cache
* any caches in the serving path (e.g. varnish)
* ISP caches
usually shift-refresh in the browser a few times gets you the fully
optimized versions.
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