Chess of Confusion

This should not be happening when i'm away from the horde of Z'z everything is fine.. meaning FPS but it's when i have a large group of the them my FPS goes down..now when you think of that it seems normal.. but NOT when your GPU and CPU are not even being touched. The lowest the FPS has dropped is 26..the highest my CPU was when this happened was 45% and GPU was 14% and everything is set to maxed in the option's.
 
FPS is uncapped i've tried turning on/off V-Sync i've tried every single setting. In my Nvidia control panel the power is set to performance in task manger i've set the game priority to high still nothing..the only time when the FPS should drop is when the CPU and GPU are hitting 100% but it's not the case so if anyone can help that would be lovely thank you.

I was thinking Skid marks or tire marks when braking fast or when braking and turning hard..also when the car is idle liquid come from the tale pipe and steam comes from it in the winter. 

O.k i don't know what i have done it could have been the recent patch but the one thing i didn't try after the patch was try back on single core again i have change some settings and here they are
 
fullscreen: YES
Borderless window: NO
V sync: YES
Mulit-core: NO 
Post-Processing: NO looks better off in my opinion
Resolution: 1929x1080
3D Models: Player only
Blood Decals: 100%
Lock framerate: 60
Offscreen Rendering: yes
Ui Rendering FPS: 30
Texture Compression: Yes
Double-Sized Textures: Yes
Lighting Quality: Medium
Lighting Update 15
New roof- hiding: yes
Enable zoom: yes
 
now the zoom's
i've only picked 50% 75% 150% 175% any more than that the fps drops for the Obvious Reasons.
 
I hope this help's everyone.     

Connall has fixed the stone hammer issue. It'll either be out in the next IWBUMS or the following update to it.

Takes a very long time to process the map  into an image. It's in progress, but could be a few days yet.

Please Up Date the Maps with there being no in game map i am relying on the PZ maps so i don't get lost so can you please update them thank you.

you mean like this map?
https://map.projectzomboid.com/#0.4534528224116182,0.20375499614825712,1.0799999999999998
 
I can agree that that official map is outdated