Imagemagick resize for google pagespeed - how to get optimal result?

Question

ImageMagick

Previously used

convert {src} -resize 200x200\> -strip -quality 75 {dst}

for optimal results.
However, on the next project, Google writes that it is possible to compress better by 11%.
Reducing the "qality" does not give a positive result, Google still offers 11% more compression.
How to achieve the same compression that google pagespeed offers.
Thank you.

Answer 1

In this case, the desired result was achieved by lowering the quality to 65.
Maybe it's a specific version of imagemagick.
On other projects quality is 75