Lofesa edited a comment on issue #1893: Lazyload filter not working
URL: 
https://github.com/apache/incubator-pagespeed-mod/issues/1893#issuecomment-496276267
 
 
   Hi
   I know your feel about this, but is stated in the 
[doc](https://www.modpagespeed.com/doc/filter-lazyload-images) "The 
lazyload_images filter defers loading of images until they become visible in 
the client's viewport **or the page's onload event fires**.".
   You can use https://yousite.com/?PagespeedFilters=+debug and take a look in 
the html code. This inject debug messages, and maybe some talk about why don´t 
lazyload don´t work.
   
   I don´t klnow too much about this fillter cause i don´t use it. Instead i 
use [lazysizes](https://github.com/aFarkas/lazysizes) script to do this.
   
   EDIT:
   Have you enabled critical image beaconing?

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