For me it's quite to opposite. I get decent FPS while outside, in the VC my fps are "ok-ish". But I get heavy FPS drops while panning around the VC with Chaseplane. Every time I move around the camera the FPS drops down to 5-10 FPS. After I stop moving the FPS get back to normal.
I haven't changed any settings after installing the 767. With all other addons (I have all airliners for P3D) I get consistent 30 FPS in the VC. Even in heavy scenarios like during approach into KFJK or EGLL. My specs: i7-8700k (5.1Ghz OC), GTX 1080Ti and 32GB Ram.

Also the VC lighting system seems to be buggy. When I turn on the Overhead Lights all other panel lights switch on too. When I switch on the panel lights -> the overhead lights turn on. Is this how it should work or is this a bug?

Just did a test - same time, same place & same gate, same weather, same settings. The FPS isn't affected in my other addons. I lock my FPS to 30 (30Hz monitor) and I get solid 30 FPS in all other aircrafts, in the 767 the FPS drop down to 5 FPS while panning. The 757 doesn't have this problem.

I HAVE BOUGHT THE 767 AND UPON THE FIRST INSTALLATION IT WORKED FINE "FOR COUPLE OF DAYS, THEN TODAY I WAS TO DO A FLIGHT FROM YUL-YYZ AND HERE ARE THE ISSUES:
1-CHASEPLANE DOES NOT WORK PROPERLY WITH THE 767, IT ONLY WORKS IN THE COCKPIT, CANT GO TO THE PRESET O
4- ONLY FLOOD LIGHTS WORK, NO PANEL LIGHTS
OUTSIDE VIEW, I KNOW ITS NOT CHASEPLANE BECAUSE IT WORKS FINE WITH FSLABS AND OTHER AIRCRAFT'S.
2-BRAKES DON'T WORK WHEN I PRESS ON IT
3-TILLER DOESN'T WORK EVEN THE RUDDER DON'T STEER THE AIRCRAFT

I UNINSTALL AND INSTALL AGAIN AND THE SAME ISSUE.

the seconde flight i did when i t/o gear up i put the autopilot on Vnav on but when i put Lnav the aircraft star truning but il like in in slew mode left to right ( nose) in the trun ????? it star to trun smood then it fast like slew ?????? will try mo make video so you cault see !

only in take off climb on decent and app in cruise it ok !

p.s sorry for my anglish i am french!

yes chase plane?