Title: error JS, HTML and speedtest
Last modified: August 22, 2016
---
# error JS, HTML and speedtest
* Resolved [ditad](https://wordpress.org/support/users/ditad/)
* (@ditad)
* [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/)
* I’m getting a 500 error from Google PageSpeed Insights when I have the JS option
checked.
* PageSpeed Insights cannot read the mobile version url when I have the HTML option
checked. I have a responsive theme.
* This is probably a conflict with W3 Total cache.
* Can you please advise me on the settings?
* [https://wordpress.org/plugins/autoptimize/](https://wordpress.org/plugins/autoptimize/)
Viewing 9 replies - 1 through 9 (of 9 total)
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/#post-5886495)
* First of all; you don’t get these errors when browsing the site yourself?
* Assuming “no”; Although I have not been able to reproduce the error and it does
not seem to be a general one (as with a lot of issues this is specific to the
javascript/ CSS that themes & plugins insert), I’ve seen [one other user](https://wordpress.org/support/topic/500-error-in-woocommerce-pages-when-crawled-by-googlebot?replies=15)
with a similar problem with errors thrown when GoogleBot visited his site.
* The [solution in that thread](https://wordpress.org/support/topic/500-error-in-woocommerce-pages-when-crawled-by-googlebot?replies=15#post-6030844)
would be applicable to your problem as well (except you might have to change
the useragent name to the one used by Google Pagespeed Insights).
* Hope this helps,
frank
* Thread Starter [ditad](https://wordpress.org/support/users/ditad/)
* (@ditad)
* [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/#post-5886530)
* Thanks, Frank. Browsing the site itself gives no errors.
* Testing leads to the conclusion that the problem is in the combination of Autoptimize
and the W3 Total Cache Minify section. PageSpeed Insights can do its job when
I uncheck the HTML minify settings in W3 Total Cache. The other option is to
use Total Cache minify, but then I need to uncheck both HTML and JS options in
Autoptimize. I am not sure yet which combination gives the best results.
* The CSS sections can be combined without errors.
* The solution in that thread does not work for my site.
* Thread Starter [ditad](https://wordpress.org/support/users/ditad/)
* (@ditad)
* [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/#post-5886532)
* Now I get a warning: Recently an error occurred while creating the CSS / JS minify
cache: No sources to serve.
W3 Total Cache warning has discovered the same issue.
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/#post-5886534)
* ah, but one should never combine different HTML/CSS/JS minification plugins.
if you want to use AO, you should disable HTML/CSS/JS minification in W3TC. I
should add that to the FAQ really.
* frank
* Thread Starter [ditad](https://wordpress.org/support/users/ditad/)
* (@ditad)
* [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/#post-5886536)
* Thanks, Frank! Now I just have to find which plugin gives the best results.
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/#post-5886537)
* just to be clear, you can use W3TC (on the contrary, you really _should_ use
a page caching plugin), you just can’t use W3TC’s minification together with
AO’s.
* frank
* Thread Starter [ditad](https://wordpress.org/support/users/ditad/)
* (@ditad)
* [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/#post-5886539)
* Thanks, I understand. Both plugins give same results for minification. I have
to find another way to further speed up my site.
* Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
* (@futtta)
* [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/#post-5886542)
* you could consider inlining your CSS (if not too large) and/ or inlining background
images as data uri’s in your CSS?
* what do tests such as google pagespeed insights and webpagetest.org say?
* frank
* Thread Starter [ditad](https://wordpress.org/support/users/ditad/)
* (@ditad)
* [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/#post-5886619)
* Google is fickle. Yesterday the first thing to do was improving server response
time and reordering css and js (not done yet), today I need to resize images (
what I already did).
Viewing 9 replies - 1 through 9 (of 9 total)
The topic ‘error JS, HTML and speedtest’ is closed to new replies.
* 
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## Tags
* [html](https://wordpress.org/support/topic-tag/html/)
* [js](https://wordpress.org/support/topic-tag/js/)
* [pagespeed](https://wordpress.org/support/topic-tag/pagespeed/)
* 9 replies
* 2 participants
* Last reply from: [ditad](https://wordpress.org/support/users/ditad/)
* Last activity: [11 years, 1 month ago](https://wordpress.org/support/topic/error-js-html-and-speedtest/#post-5886619)
* Status: resolved