Higher Resolution Higher FPS in games

[samuelinv29]

When i got higher resolution i got more fps and when i got lower resolution than i have less fps .
I dont know what to do with it.
PC Specs:
Intel Pentium G640
Nvidia GeForce 1050 OC 3G Windforce
2x4gb ram ddr3 1666mhz
320W Power Supply.
Thanks for any response!

 

[Vic 40]

Only thing i can think of is that it is a limitation of the cpu. With a higher res the gpu takes up most of the work,when using the lower res the cpu needs to work harder,but really can't and somehow even produces less fps.