1. Only problem I’ve seen with clients is the API key takes forever to arrive. Not sure if this is an issue with their service or something else going on with client spam filters, etc.

    1. I wouldn’t mind waiting for API key if once you have it the compressed images arrive fast (or even instantly) :)

    2. No worries, received API Key in less than 5min

  2. “The number one reason to use a plugin to compress PNG images is to speed up your site.”
    You’ve said enough Sarah.
    Anything that speeds up WordPress has to be good!

    BTW notice that you are using Jetpack comments… any chance of a post explaining why you made the change from native WordPress comments?

    1. Jetpack Comments gives people more ways to authenticate so hopefully it will be easier to comment :)

      1. You don’t find that JetPack’s overhead outweighs the comment functionality? I love the commenting features, but all of the other pieces seem so “heavy”.

        1. To cut down on overhead, you can deactivate Jetpack modules that you don’t want to use, as explained here. For example, you could deactivate all modules except Jetpack Comments. And if you are experiencing any specific issues, let us know! We’d be happy to take a look!

          1. Looks useful Ryan.
            I keep seeing the Jetpack comments module on various sites and it does look good.

            Are there any figures available on comments before and after using the module?

    1. I do also like that plugin and have used it quite frequently. Sometimes I have found that the Smush.it service goes down for days at a time, so that can be a little frustrating. I’d recommend TinyPNG for sites that are PNG heavy.

      1. I have a lot of failures with SmushIt, which is why this one is so appealing to me.

          1. It’s not a WordPress plugin (though I’ve asked about if it can be ported into one), but JPEGmini is a local Windows and Mac app that does amazing things with JPGs, cutting down bytes by up to 70%, with no visual difference. I dropped a 10.7GB directory of mostly JPG files on to it, and it was just 5.72GB when it had finished!

            Thanks for the post Sarah – I was wondering if there was something with the power of JPEGmini for PNG, instead of WP-Smushit.

        1. WP Smush.it has file size limit of 1MB (it’s Yahoo’s limit, not plugin’s) and this can be frustrating =(

          Anyway, thank you for the post, Sarah!

  3. Perhaps I missed something – I tried this with uploading a new image and use it as background. However, after a reload of the page, the original, non-compressed image is transferred.
    What is supposed to happen once compressed?

    Thanks – Will

  4. At the moment I’m using EWWW Image Optimizer ( http://wordpress.org/plugins/ewww-image-optimizer/ ) The fact it can compress more types of images makes it more useful (and everything is done locally, so you are not depending on outside services), but it would be interesting to compare the compression savings.

    I guess off-site compressors are good for those on shared hosting, where compression tasks can result in big CPU usage spikes (that’s why some companies do not allow compression plugins to be used).

    1. Anonymous

      EWWW Image Optimizer is superb. It optimizes automatically all new images of media library, has cloud optimization support, can optimize different types of images (jpg, png, gif), convert images (gif to png is great), can optimize theme images and any images in custom locations and support scheduled runs.

      After seeing the title of this post I was surprised it was not about EWWW.

  5. I have already installed WP Smush-it plugin.
    Next, i try to install Compress PNG for WP, when i compress via media library,
    This say that image already saved (by wp smust-it).

    I think WP smush it best.

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