I'm trying to optimize my new site using several online tools, including WebPageTest.org.
One common thread in most reports: images could be further compressed, and Progressive JPEG is recommended.
So, questions:
1.) Is it possible to set a different compression level? If so, where & how?
2.) Is it possible to use Progressive JPEGs as the output?
3.) Is it possible to disable image caching COMPLETELY, and use pre-optimized JPGs?
1. Better if you prepared images before upload in Opencart (use Photoshop or similar software for this)
In Opencart you can set image compression value manually in file system\library\image.php
in line
where 90 - image compression value (by default and recommended)
2. Yes, to add Progressive JPEGs also in this file system\library\image.php
before line
add this
3. Not recommended
PS: after change 1-2 need to clear images cache folder
In Opencart you can set image compression value manually in file system\library\image.php
in line
Code: Select all
public function save($file, $quality = 90) {2. Yes, to add Progressive JPEGs also in this file system\library\image.php
before line
Code: Select all
imagejpeg($this->image, $file, $quality);Code: Select all
imageinterlace($this->image, true);PS: after change 1-2 need to clear images cache folder
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