Low FPS

Hello everyone! I have low FPS in BeamNG drive. Not always, but when there are some objects. For example: scenario "Delivery Truck Takedown"- in "realtime" mode i have about 18-20 FPS. When I turn on sloe motion (x2), i have about 30-35 FPS. In any clow motion x2-x100 i have about 30 FPS(in pause also 30 FPS). What is the cause and is it possible to increase the FPS in "realtime"?
-Graphic settings: mesh quality-low, textures quality-normal. Other i set lowest.
-The CPU load is not higher than 30%, RAM usage is about 6.1 GB (the game use about 2.3-2.5GB)
-Temperatures of CPU and GPU is about 60-80 degrees (not stable)(I just cleaned up the notebook from dust)
-Windows 7 64bit
Core i7 2670QM 2.20 GHz
8Gb RAM
GeForce GT 540M
Resolution 1280*1024 (Now I use another monitor with lower resolution than laptop screen)

When there are not many objects, for example Pure map with one car- FPS is stable about 55-60.
Also i tried to launch the game with FullHD resolution 1920*1080 on laptop screen, but the result is almost the same- insted of 18-20 FPS is about 16-17, insted of 30 FPS- about 20-23 (in any slow motion)
P.S. Sorry for my English, I am from Russia.

 

GPU bottleneck. A 540M won't run the game even in low settings.

 

Why dont you get yourself a decently specced PC to play it on...that Laptop doesnt even have the horsepower for BeamNG Drive Tech Demo!