Image Optimization recommendations

[Анастасия Рубанова]

Could you please help us understand an unclear behavior of PageSpeed Tools. This is how we come across the problem:

1) analyzed the page, e.g: 
http://www.floorcare.com/parts-and-accessories

2) went to the recommendations "Optimize the images": http://prntscr.com/emyto2

3) chose the image from the list, e.g.: http://www.floorcare.com/media/catalog/product/cache/1/small_image/430x404/9df78eab33525d08d6e5fb8d27136e95/r/p/rpts200_-_star_cutter_closeup.jpg 
The service recommends to optimize it on 3,9 КБ (18 %) 

4) You recommend to use jpegoptim with --strip-all parameter on the page: https://developers.google.com/speed/docs/insights/OptimizeImages 
http://prntscr.com/emyx07

5) installed jpegoptim 1.4.4: 
http://prntscr.com/emyxgy

6) optimized the image on 4,09%: 
http://prntscr.com/emyxyk

7) Analyze the page one more time, the problem still persists http://prntscr.com/emyylw

8) optimized one more time with jpegtran, the result of optimization is 6,3%

Let us know which applications and parameters PageSpeed Tools uses for optimization: 
The image attached rpts200_-_star_cutter_closeup.jpg

[Save A lot Shops]

You may want to try:

http://www.tutorialspoint.com/online_image_optimizer.htm

It will provide you with several options:

50%, 75%, Lossles, or custom.

           

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