The AV software does play a part in the absolute time.

But the relative time increase when adjusting for row height
appears to be quite similar whether or not the AV is enabled..

Running the program from a .exe.

With AV disabled:
No adjustment for row height: 19 seconds
Adjustment for row height: 36 seconds


With AV Enabled:
No adjustment for Row height: 25 seconds
No adjustment for row height: 24 seconds

Adjustment for Row height: 50 seconds
Adjustment for row height: 47 seconds