Yep, the FPS increase will only be visible if you're CPU bound since it basically only affects the CPU load.
@Craig said in JF PA-28 Arrow CPU Heavy?:
Unfortunately, Third Party aircraft cannot be compared in anywhere to basic aircraft in MSFS, Third part aircraft will contain a lot more custom code and generally more realistic than anything from the base sim, meaning that it will use more resources than anything from the base sim.
Well this is a bold statement if even a complex airliner which definitely has more lines of code and logic and screens has less FPS impact.
The EFB with it's static display eating so much CPU power is simply unoptimized and should be fixed. There is no reason that the EFB alone (the rest of the logic is still working fine while the EFB is off!) costs so much performance.