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Gzip compression


sunreader
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Hi, I noticed that by default, prestashop content is not being gzip compressed.

My question is: why?

 

adding this to the .htaccess file, improves the loading quite a lot.

 

 

 

# compress text, HTML, JavaScript, CSS, and XML
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript

# remove browser bugs
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
Header append Vary User-Agent

 

Source: http://gtmetrix.com/enable-gzip-compression.html

 

 

Here's my sites result before and after gzip compression:

 

No gzip:

7JWo5.png

 

 
gzip: 
7JWoE.png

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gzip compression first needs to be enabled on your hosting web server configuration (apache, nginx etc..)

 

With that enabled, then go to you back office, advanced preferences > performance section, and make sure 'apache optimization' is enabled.  Then Prestashop will add the following to your .htaccess file. 

 

Note:  This likely only works with apache, since nginx has different configuration settings and normally does not read the htaccess files.

 

You can also alter/override the Tools::generateHtaccess function to add or remove anything specific to your hosting environment.

<IfModule mod_expires.c>
    ExpiresActive On
    ExpiresByType image/gif \"access plus 1 month\"
    ExpiresByType image/jpeg \"access plus 1 month\"
    ExpiresByType image/png \"access plus 1 month\"
    ExpiresByType text/css \"access plus 1 week\"
    ExpiresByType text/javascript \"access plus 1 week\"
    ExpiresByType application/javascript \"access plus 1 week\"
    ExpiresByType application/x-javascript \"access plus 1 week\"
    ExpiresByType image/x-icon \"access plus 1 year\"
    ExpiresByType image/svg+xml \"access plus 1 year\"
    ExpiresByType image/vnd.microsoft.icon \"access plus 1 year\"
    ExpiresByType application/font-woff \"access plus 1 year\"
    ExpiresByType application/x-font-woff \"access plus 1 year\"
    ExpiresByType application/vnd.ms-fontobject \"access plus 1 year\"
    ExpiresByType font/opentype \"access plus 1 year\"
    ExpiresByType font/ttf \"access plus 1 year\"
    ExpiresByType font/otf \"access plus 1 year\"
    ExpiresByType application/x-font-ttf \"access plus 1 year\"
    ExpiresByType application/x-font-otf \"access plus 1 year\"
</IfModule>

FileETag INode MTime Size
<IfModule mod_deflate.c>
    <IfModule mod_filter.c>
        AddOutputFilterByType DEFLATE text/html text/css text/javascript application/javascript application/x-javascript
    </IfModule>
</IfModule>

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  • 3 months later...

Thanks for this Tips. I am a newbie on this topic. I activated everything (CCC) in the admin. I can see clearly improvements when I test on gtmetrix. 

 

But it doesnt make the gzip properly. Some files are done (or at least gtmetrix doesnt show them anymore). But gtmetrix show me:

 

Compressing the following resources with gzip could reduce their transfer size by 236.9KiB (72% reduction).

Any idea how I can make this work? If its really possible to save 236.9KB, this would be amazing. 

What would you say is a good KB-Size for the prestashop Homepage?

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I'm not sure why the .js and .css files are not being compressed, I would have to assume that your apache/nginx settings are not configured to compress those file extensions.

 

236KB is not a lot in this day and age.  It may actually take more time to compress these 2 files then it would be to download them to the clients browser

 

The third file i assume is html content of the home page, so again I would have to assume that your webserver is not configured to compress .html or .php file output

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  • 2 months later...

I have the same problem, js and css files are not gzipped, this is my .htaccess file:

# ~~start~~ Do not remove this comment, Prestashop will keep automatically the code outside this comment when .htaccess will be generated again
# .htaccess automaticaly generated by PrestaShop e-commerce open-source solution
# http://www.prestashop.com - http://www.prestashop.com/forums

<IfModule mod_rewrite.c>
<IfModule mod_env.c>
SetEnv HTTP_MOD_REWRITE On
</IfModule>

RewriteEngine on
RewriteRule . - [E=REWRITEBASE:/]
RewriteRule ^api/?(.*)$ %{ENV:REWRITEBASE}webservice/dispatcher.php?url=$1 [QSA,L]

# Images
RewriteRule ^([0-9])(\-[_a-zA-Z0-9-]*)?(-[0-9]+)?/.+\.jpg$ %{ENV:REWRITEBASE}img/p/$1/$1$2$3.jpg [L]
RewriteRule ^([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?(-[0-9]+)?/.+\.jpg$ %{ENV:REWRITEBASE}img/p/$1/$2/$1$2$3$4.jpg [L]
RewriteRule ^([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?(-[0-9]+)?/.+\.jpg$ %{ENV:REWRITEBASE}img/p/$1/$2/$3/$1$2$3$4$5.jpg [L]
RewriteRule ^([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?(-[0-9]+)?/.+\.jpg$ %{ENV:REWRITEBASE}img/p/$1/$2/$3/$4/$1$2$3$4$5$6.jpg [L]
RewriteRule ^([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?(-[0-9]+)?/.+\.jpg$ %{ENV:REWRITEBASE}img/p/$1/$2/$3/$4/$5/$1$2$3$4$5$6$7.jpg [L]
RewriteRule ^([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?(-[0-9]+)?/.+\.jpg$ %{ENV:REWRITEBASE}img/p/$1/$2/$3/$4/$5/$6/$1$2$3$4$5$6$7$8.jpg [L]
RewriteRule ^([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?(-[0-9]+)?/.+\.jpg$ %{ENV:REWRITEBASE}img/p/$1/$2/$3/$4/$5/$6/$7/$1$2$3$4$5$6$7$8$9.jpg [L]
RewriteRule ^([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])([0-9])(\-[_a-zA-Z0-9-]*)?(-[0-9]+)?/.+\.jpg$ %{ENV:REWRITEBASE}img/p/$1/$2/$3/$4/$5/$6/$7/$8/$1$2$3$4$5$6$7$8$9$10.jpg [L]
RewriteRule ^c/([0-9]+)(\-[\.*_a-zA-Z0-9-]*)(-[0-9]+)?/.+\.jpg$ %{ENV:REWRITEBASE}img/c/$1$2$3.jpg [L]
RewriteRule ^c/([a-zA-Z_-]+)(-[0-9]+)?/.+\.jpg$ %{ENV:REWRITEBASE}img/c/$1$2.jpg [L]
# AlphaImageLoader for IE and fancybox
RewriteRule ^images_ie/?([^/]+)\.(jpe?g|png|gif)$ js/jquery/plugins/fancybox/images/$1.$2 [L]

# Dispatcher
RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [NC,L]
RewriteRule ^.*$ %{ENV:REWRITEBASE}index.php [NC,L]
</IfModule>

AddType application/vnd.ms-fontobject .eot
AddType font/ttf .ttf
AddType font/otf .otf
AddType application/x-font-woff .woff

<IfModule mod_expires.c>
	ExpiresActive On
	ExpiresByType image/gif "access plus 1 month"
	ExpiresByType image/jpeg "access plus 1 month"
	ExpiresByType image/png "access plus 1 month"
	ExpiresByType text/css "access plus 1 week"
	ExpiresByType text/javascript "access plus 1 week"
	ExpiresByType application/javascript "access plus 1 week"
	ExpiresByType application/x-javascript "access plus 1 week"
	ExpiresByType image/x-icon "access plus 1 year"
	ExpiresByType image/svg+xml "access plus 1 year"
	ExpiresByType image/vnd.microsoft.icon "access plus 1 year"
	ExpiresByType application/font-woff "access plus 1 year"
	ExpiresByType application/x-font-woff "access plus 1 year"
	ExpiresByType application/vnd.ms-fontobject "access plus 1 year"
	ExpiresByType font/opentype "access plus 1 year"
	ExpiresByType font/ttf "access plus 1 year"
	ExpiresByType font/otf "access plus 1 year"
	ExpiresByType application/x-font-ttf "access plus 1 year"
	ExpiresByType application/x-font-otf "access plus 1 year"
</IfModule>

FileETag INode MTime Size
<IfModule mod_deflate.c>
	<IfModule mod_filter.c>
		AddOutputFilterByType DEFLATE text/html text/css text/javascript application/javascript application/x-javascript
	</IfModule>
</IfModule>

#If rewrite mod isn't enabled
ErrorDocument 404 /index.php?controller=404

# ~~end~~ Do not remove this comment, Prestashop will keep automatically the code outside this comment when .htaccess will be generated again

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this likely means one of a few things

1) your web server is not configured to perform gzip, so you would need to work with your host to enable this.

2) the mod_deflate and/or mod_filter extensions are not enabled.

 

If I had to take a guess, I suspect those 2 extensions are disabled...

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But it's strange because on old theme with PS1.4.9 i get a Page Speed Grade near to 90%, with gzip at the best score.

I try to re-ask to my hosting provider.

 

 

EXIT:

You were right, mod_deflate and mod_filter was disables. Now i get Page Speed Grade: 87% and YSlow Grade: 86%.

Edited by DARKF3D3 (see edit history)
  • Like 1

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  • 2 months later...

For me work this solution.

 

If your web server is Apache, and if the mod_deflate module is enabled on it, the following method is the easiest way to get compression enabled for your entire web site. You just insert something like this to the .htaccess file in your web document root folder:

 

 

<IfModule deflate_module>
    # Enable compression for the following file types.
    AddOutputFilterByType            \
     DEFLATE                         \
      application/javascript         \
      text/css                       \
      text/html                      \
      text/javascript                \
      text/plain                     \
      text/xml
</IfModule>

 

PS 1.6.

Edited by Compolux (see edit history)
  • Like 1

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