Pagespeed error ? - Wordpress

[Baraque Obahamas]

Someone knows why I have some lines on my website from a mobile ? I use wordpress

https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Flebonstream.net&tab=mobile

It's the same with my phone (oneplus one). :/

[Baraque Obahamas]

Or test: https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Flebonstream.net%2Fbig-buck-bunny%2F

[Jeff Kaufman]

Yes, I see this on your site on mobile with PageSpeed=on and not with PageSpeed=off:


​

This is a PageSpeed bug; thanks for reporting it!

The JS text that's getting shown here is from PageSpeed's critical image beaconing code, which gets inserted before the first image on the page, turning:

<a class="logo" href="http://lebonstream.net" title="Lebonstream | Un site utilisant WordPress"><img src="http://lebonstream.net/wp-content/uploads/2015/05/logo-header.png" alt="Lebonstream | Un site utilisant WordPress"/></a>

into:

<a class="logo" href="http://lebonstream.net" title="Lebonstream | Un site utilisant WordPress"><script pagespeed_no_defer="">(function(){var g=this,h=function(b,d)...pagespeed.CriticalImages.Run('/ngx_pagespeed_beacon','http://lebonstream.net/?a=b','bOk8u7_prl',true,false,'-tCPhA9VMdE');</script><img src="http://lebonstream.net/wp-content/uploads/2015/05/xlogo-header.png.pagespeed.ic.m4z1_NscpC.png" alt="Lebonstream | Un site utilisant WordPress" pagespeed_url_hash="1901629196" onload="pagespeed.CriticalImages.checkImageForCriticality(this);"/></a>

Because our critical image beaconing code doesn't need to run on every request, this is intermittent and harder to debug.  Here's a static copy of your site, though, that has this problem:

http://www.jefftk.com/repro-bad-js-issue2?PageSpeed=off

Here's a simplified page with the same problem:

http://www.jefftk.com/repro-bad-js-issue3?PageSpeed=off

The basic issue is that we're inserting JS inside a tag that you've set all the children of to "display: inline-block".

A fix is to put display:none on the js we insert:

http://www.jefftk.com/repro-bad-js-issue4?PageSpeed=off

$ diff repro-bad-js-issue{3,4}.html

7c7

< <script pagespeed_no_defer="">

---

> <script style="display:none" pagespeed_no_defer="">

I filed a bug and will fix this: https://github.com/pagespeed/mod_pagespeed/issues/1087

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[Baraque Obahamas]

Thank you for the fix! But I don't know where found <script pagespeed_no_defer=""> - can you help me ?

Thank you

[Jeff Kaufman]

Sorry, this is something that has to be fixed within PageSpeed. We're
adding a fix to a bugfix release we're preparing now.

As a workaround, you could disable the beacon js, which is what's
causing this problem:

pagespeed CriticalImagesBeaconEnabled false;

https://developers.google.com/speed/pagespeed/module/config_filters#beacons

[Baraque Obahamas]

Ok ok, it's done :) Thank you

About memcached, can I activate it or pagespeed take care of the pages cache ?

[Jeff Kaufman]

PageSpeed caches optimizations on your disk by default. If you'd like
it to use memcached instead, perhaps because you have multiple servers
which could share a cache, see:
https://developers.google.com/speed/pagespeed/module/system#memcached