Cloussaus said everything perfectly, I just want to add something. If you are annoyed by the spinning itself, you can turn off icon animation. Go to Program Settings, Appearance and unckeck the ANIMATE THE ICON WHEN SCANNING.
However it will not speed up anything significantly, because it's just icon animation related, not scanning level related. As Cloussau already mentioned you would have to disable few providers, but than again, why would anyone want to be without protection. That's why we installed antivirus in the first place.
Disabling of those providers is highly NOT recommended.