Hello,

I just had to reinstall P3D from scratch, due to some scenery loading issues, and upgraded to P3D v4.2. This is a completely clean install, except for the A2A Commanche installed. Earlier, I used to be able to get a smooth 25fps in the PMDG 737, with ORBX Global, and payware scenery.

But now, after the reinstall, the frame rate wont go above 20, and is usually around 15. This is in the default Mooney, at the default P3D startup airport. I have tried editing my affinity mask, FFTF entry, turning off shadows, but it still wont go above 15-20 fps. Also, earlier, when running v4.1, the CPU use on the main core (core 2) used to above 95%, with other cores chipping in when loading scenery. Now, with v4.2, the main core wont even go above 60% for some reason.

I have no clue what is causing this, and how to go about diagnosing it. Any help is appreciated.

Some info on your system might be helpful.

Vic

System is 

Intel i7-4720HQ @ 2.6GHz

NVDIA GTX 860M 4GB

12GB RAM

Running P3D off the HDD

Windows 10 Home

I know its not a beefy system, but it used to get the job done fine with P3D v4.1

I don't believe there were any significant changes in 4.2 that would cause that. 

You say a complete fresh install - did that include ALL of your addons, prepar3d.cfg, XML files etc? SO ytou completely UNinstalled P3D and all addons, deleted any left over files in the various ujserdata and programdata folders and then installed 4.2?

Since you had to reinstall due to a problem, I'd suspect that perhaps some corruption of other files might be the culprit.

Be sure your current settings are exactly the same as old.

Vic

Try deleting the P3d config file, restart P3d and let it rebuild the config.  Don't change any settings, or run any addons and let us know what happens.