Relationship between Thumbnails and iO.wp.com and i2.wp.com?

  • Unknown's avatar
    condiments · Member ·

    After I uploaded a photo, I used FTP (FileZilla) to inspect my Media Library. As I expected my original photo was there:

    along with 6 additional formats, including what I assumed was the Thumbnail:

    I carefully cropped and compressed the original to make my own version of a 150×150 thumbnail. I used the same name as assigned by WP [above]. I then uploaded it with FileZilla, replacing the WP version with my own. I assumed that by using the same name, this would work fine.

    However, something else seems to be at work. Is there an extra step required to get WP to recognize a revised thumbnail file?

    ADDITIONAL POINTS
    After noticing my posts were using the original WP thumbnails, I inspected the thumbnail. The SRC looks right:
    src=’https://bentpalate.ca/files/2020/02/ragbrai-iowa-2019-map-day1-150×150.jpg’
    There are additional properties (that I assume are the problem), such as:
    srcset=’https://i0.wp.com/bentpalate.ca/files/2020/02/ragbrai-iowa-2019-map-day1.jpg?resize=150%2C150&ssl=1 150w, https://i0.wp.com/bentpalate.ca/files/2020/02/ragbrai-iowa-2019-map-day1.jpg?zoom=2&resize=150%2C150&ssl=1 300w, https://i0.wp.com/bentpalate.ca/files/2020/02/ragbrai-iowa-2019-map-day1.jpg?zoom=3&resize=150%2C150&ssl=1 450w’

    It appears that some feature of my WP configuration is causing one or more versions of my thumbnail to be created at the ‘i0.wp.com/’ location, and it happened after I uploaded the original photo but before I uploaded my version of the thumbnail.

    Any help will be very much appreciated! (I carefully created 21 thumbnails to date, and none are being used.)

  • kokkieh · Staff ·

    Hi there,

    The i0.wp.com and i2.wp.com URLs are for the Jetpack plugin’s site accelerator feature. With that feature active, when you use an image in a post or page, copies of that image at the size at which you used it is uploaded to multiple servers around the world. This helps your site load faster, as visitors to your site would be downloading the image from the server that’s geographically closest to them. It also reduces bandwith usage on your server, as there images are then being served from our CDN’s servers, rather than your host’s.

    Jetpack

    If the CDN is using the thumbnails created by WordPress rather than the ones you manually uploaded, it means the CDN likely cached that image before you replaced it. As your replaced version uses the exact same filename, the CDN has no way of knowing it’s a different image, so it won’t cache the new version instead.

    I don’t know of a way to prevent this from happening aside from disabling the CDN entirely. You can do that under My Site ->Manage ->Settings ->Performance. For more help with this, I recommend you contact the Jetpack support team directly.

    Contact Support

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