I honestly think everyone with server sudo access should use this add-on.

I tested the Image Optimizer add-on to see what kind of file savings were possible. It looks like all images will be optimized, at least a modest amount, but poorly optimized JPEG and PNG files are greatly reduced in size.

Examples:
- A large PNG file with a transparent background was 484KB. After optimizing it was 156KB.
- A medium size JPEG file was 44KB. After optimizing it was 23KB.

The savings will depend on the image and if it is already optimized or semi-optimized.

I can see this add-on being used in combination with the core Image Uploading automatic resize feature. This would address the common problem of users uploading very large, unoptimized images and damaging page load performance.

Installs fairly easy, although you'd need server access to require some libraries to get this thing going OR a TinyPNG account. Once downloaded, you're up and running in a matter of seconds. Click click and automate the "Job" to optimize your images once every [x] days!

Lot of my clients are still on 5.7.x though, so unfortunately only for those clients updating to 8.x or new projects.

Google will like this Add-On too.

This plugin works just as stated. Version 2.0 really make this plugin complete with the addition of TinyPNG Compression. Saved over 25MB on client site after compression job was run. Will be looking forward to more plugins from this developer.

We've all had the clients who want the largest graphic carousel in the world on their home page, right? Me too. While I talk and talk about page speed, they do not care. Well, since our main focus is SEO, we HAVE to deliver speed.

I installed this plugin, plugged in the tinyPNG API, let it process... and this site went from a 9 (google page speed) to a 31! So, I purchased the HTML Minify product as well. The site is much, much faster and now I am not embarrassed to show it off. GREAT JOB!

Used this addon to optimize my first community store project. With the integration of tinypng it optimized every product page and I have a faster page load.
The addon has some clever options for optimal processing of all images. Even the cached ones.
Thanks a lot a3020!

This works great. For websites where customers upload unoptimized images it has a huge effect on page load. Since this is a job that can run periodically you can optimize daily.
Very helpful tool!

quite OK.

To echo the other reviews, this is a great add-on. TinyJPG's free offering only allows for 500 images per month - however if you've got sudo access to your server then using the server side software works a charm without a quota.

Works well using a cronjob. I use it for large sites where users add lots of news and projects and forget to compromise images a bit ;)

(by the way, the link from adding a review from the page plugin is not correct on index.php/dashboard/files/image_optimizer/search)

Great plugin, great support!
Extremely well thought out, works very well!
Best plugin on the market!
This plugin is worth its weight in gold.

A great job optimising files and speeding up a site, all files saw a reasonable reduction in size both jpg and png's.

I recommend this addon for everyone as it will save time manually optimising your images before uploading.

Had a small issue, myself to blame and support was excellent :)

I'm compressing with tinypng, but it's very time consuming. Only about 20 files progress in one night. Also, the server response is slow.
The server is fast enough.
My environment may be bad, but I'm having trouble.

postscript
I set the batch size to 1 and it worked properly.