Sorry, forgot to mention it's an advanced option.
In the location bar, type
opera:configIn the Quick find box type
imageYou'll see the check box to disable
Interpolate imageI also type
trans and disable the
Activate On New Transfer option so the super annoying download window doesn't pop up constantly.
Shift+F12 opens display options, I disable the skin and use standard, disable special effects, on Toolbars I disable Start bar and enable Status bar, set Progress bar to off. On Buttons tab, I right click all the crap on the address bar and remove, then add a Home button, and add the 3rd thru 8th fields of the status bar.
Then it's just Ctrl+F12 and adjust other options, and I've got a lean mean browsing machine.
