This addon (don't care which version, if I remember correctly) on google (next to links or on the images) always starts after 5-10 minutes after the browser is opened (despite the icon on the toolbar of Opera works from the start showing appropriate colors); actually on the start no actual icon is showed (therefore I'm not talking about color not showed yet), also my browser isn't doing anything that could possibly stop or slow down the addon.
https://addons.opera.com/extensions/details/wot/?display=it&reports#r58615