Title: Enable optimize Javascript will make the website slow Last modified: September 21, 2016 --- # Enable optimize Javascript will make the website slow * [Justlinera](https://wordpress.org/support/users/justlinera/) * (@justlinera) * [9 years, 8 months ago](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/) * Hi, * When I enable ‘Optimize JavaScript Code’ the website will load slower than before. Id did not have this problem in earlier versions of Autoptimize, but the recent update caused this. * Can you help me resolve this issue? * Thank You Viewing 8 replies - 1 through 8 (of 8 total) * Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/) * (@futtta) * [9 years, 8 months ago](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/#post-8206087) * OK; do you have “aggregate inline JS” on? * and can you share your site’s URL? - This reply was modified 9 years, 8 months ago by [Frank Goossens](https://wordpress.org/support/users/futtta/). * Thread Starter [Justlinera](https://wordpress.org/support/users/justlinera/) * (@justlinera) * [9 years, 8 months ago](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/#post-8222061) * Hi, * Yes I tried that. The link is: [https://goldenagecheesestore.com/](https://goldenagecheesestore.com/) - This reply was modified 9 years, 8 months ago by [Justlinera](https://wordpress.org/support/users/justlinera/). * Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/) * (@futtta) * [9 years, 8 months ago](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/#post-8222126) * Impossible for me to assess now I’m afraid, as you have JS optimization turned off. Do you have a non-production site where we could investigate this further? * groetjes, frank * Thread Starter [Justlinera](https://wordpress.org/support/users/justlinera/) * (@justlinera) * [9 years, 8 months ago](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/#post-8230542) * Hi, * Yes this a non production website: [http://corpa-advies.bureaufeith1.nl/en/home-en/](http://corpa-advies.bureaufeith1.nl/en/home-en/) * Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/) * (@futtta) * [9 years, 8 months ago](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/#post-8231295) * hi justlinera; are JS settings the default ones (i.e. “aggregate inline JS” off + exclude `js/jquery/jquery.js` + NOT “force JS in head”)? * kind regards, frank * Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/) * (@futtta) * [9 years, 8 months ago](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/#post-8231739) * if that does not work (and as I’m seeing a “white page of death” when trying to access your non-prod site which usually is a bad sign) try to switch to the legacy minifiers (as per [the FAQ](https://wordpress.org/plugins/autoptimize/faq/)) by adding this to your wp-config.php: * `define("AUTOPTIMIZE_LEGACY_MINIFIERS","true");` * I would also be interested in any error you might find in your php errorlog. * Thread Starter [Justlinera](https://wordpress.org/support/users/justlinera/) * (@justlinera) * [9 years, 8 months ago](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/#post-8233580) * I added the code in the wp-config and that fixed the ‘white page of death’. These where the errors I was getting: * – PHP Fatal error: Maximum execution time of 30 seconds exceeded in /home/corpa/ domains/corpa-advies.nl/public_html/wp-content/plugins/autoptimize/classes/external/ php/minify-2.3.1-jsmin.php on line 295, referer: [https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/) – PHP Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0, referer: [https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/)– PHP Fatal error: Maximum execution time of 30 seconds exceeded in /home/corpa/ domains/corpa-advies.nl/public_html/wp-content/plugins/autoptimize/classes/external/ php/minify-2.3.1-jsmin.php on line 295, referer: [http://corpa-advies.bureaufeith1.nl/wp-admin/options-general.php?page=autoptimize](http://corpa-advies.bureaufeith1.nl/wp-admin/options-general.php?page=autoptimize)– PHP Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0, referer: [http://corpa-advies.bureaufeith1.nl/wp-admin/options-general.php?page=autoptimize](http://corpa-advies.bureaufeith1.nl/wp-admin/options-general.php?page=autoptimize) * Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/) * (@futtta) * [9 years, 8 months ago](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/#post-8233666) * thanks for the confirmation & for the error-info. There’s likely one specific file (which will be one that is not “common”) on which the updated minifier is choking. I’ll see if I can reproduce this using the JS on your site. * frank Viewing 8 replies - 1 through 8 (of 8 total) The topic ‘Enable optimize Javascript will make the website slow’ is closed to new replies. * ![](https://ps.w.org/autoptimize/assets/icon-256X256.png?rev=2211608) * [Autoptimize](https://wordpress.org/plugins/autoptimize/) * [Frequently Asked Questions](https://wordpress.org/plugins/autoptimize/#faq) * [Support Threads](https://wordpress.org/support/plugin/autoptimize/) * [Active Topics](https://wordpress.org/support/plugin/autoptimize/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/autoptimize/unresolved/) * [Reviews](https://wordpress.org/support/plugin/autoptimize/reviews/) * 8 replies * 2 participants * Last reply from: [Frank Goossens](https://wordpress.org/support/users/futtta/) * Last activity: [9 years, 8 months ago](https://wordpress.org/support/topic/enable-optimize-javascript-will-make-the-website-slow/#post-8233666) * Status: not resolved