Pretty much the same behaviour i have noticed in the security check, sometimes the *G/business fasttrack line is longer than the normal
I have been on quite a few morning flights out of ARN over the last three weeks and lines for regular security has been about 300 persons at least (typical vacation crowd). With the line for SK Fast Track empty and super quick.
The *G check in desk (not the ones used for the US flights) have however been over crowded.