If you take the average rate of fire as being about 800-1000 rounds per minute(it varies from gun to gun) and the Bf 109 had a three blade prop turning at about 2000rpm that’s 6000 blades a minute you have to get past those guns so you can bet it reduced the rate of fire by a huge ammount. IIRC even the first world war aircraft with only a 2 blader were losing something like 50% of their rate of fire.