Since writing I found this in the override options..
EWWW_IMAGE_OPTIMIZER_JPG_LEVEL?– (0, 10, 20, 30, 40) A zero is no compression, level 10 is Pixel Perfect (lossless), level 20 is Pixel Perfect Plus (lossless via API), level 30 is Premium (lossy), and level 40 is Premium Plus (maximum lossy).
However, the maximum compression I can get on the ‘full’ image is 5%.
Upping the value from level 10 to level 40 only increases the compression by 2%… I even tried higher numbers up to 80, it made no difference.
So a 1.8mb image remains at 1.7mb, it’s something, but it’s not going to make a noticeable difference to page load times.
Is there not a way to force compression rates higher than 5% on the largest images?
Thanks