What check boxes do you mean ?, and at what zoom level do you have the page/s that you are seeing this set at ?.
Have you tried adjusting the zoom level for these affected pages ?.
Creating a temp folder is also done with "Open With Application" extension. And this can be cleanded automatically or manually at any time when Opera is open.
hey vux777 , thanks for replied my post. it looks like Opera made the turbo menu more simple now. i tested some images to see it compressed or not, some of them compressed 😃