First: I have raised a support ticket already.

Dear Flight-Simmers!

I have found an issue with severe FPS Loss from 60 FPS in VR and also 2D Dislay, down to 20 FPS and even less, when changing the ND DIsplays ranges AND only occuring when FIXES are set.

In my case 2 ETOPS: HKJK and HTKJ on my route from OMDB to FMEE.
HKJK 1108 (Put in FMC as HKJK and /1108)
HTKJ 1113 (Put in FMC as HTKJ and /1113)

Important: Fixes do not always cause FPS loss. When I used these fixes with other smaller and bigger parameters then /1108 and /1113, I did not have any issues. In my case I had them with exact these numbers and at one other flight also at KSFO arrivel with KSFO fix set and with /15, /11 and /6 (no Bearing, only Distance) set in FMC (to get Dotted green lines to be aware of for Flaps Settings).


My Route:
OMDB/12R N0494F340 ANVI5G ANVIX DCT GIDIS G783 UKRAG/N0494F350 L710 MEMTU/N0494F340 L710 DEDSO/N0490F360 R401 SUHIL/N0482F350 DCT AMBAN/N0476F370 UM314 NIBIS NIBI1R FMEE/12

1) I started a flight at Gate B10 OMDB. Loaded the flightplan via SimBrief in the FMC. My Default startup is a stored startup Profile (stored it with the name "Apron") at which all cockpit knobs etc. are set to my wishes. APU is running, engines are off.

2) Did my Preps and taxied for Departure via 12R

3)Took off and flew my departure route. At 8000FT i activated the AP

4) During CRZ I changed the ND Display Ranges from 80 to 320. All good so far.
5) When I reduced the ranges, with every range change (320 - 160 - 80 - 40 - 20 etc, etc) my FPS dropped significantly from 60FPS down to 20. The FPS drop has a bigger impact, when all ND Displays show the ND as MAP or PLAN). In my case the First Officer and Captain.
6) When I increased ranges up again, FPS came partially back. Allthough never to 60 FPS again, but somewhere between 40 and 45 FPS. The bigger the range, the higher the FPS. This is reproducable.
7) Turning of the ND displays via FMC PMDG Settings did completely solve the issue, till turning the Displays on again.
😎 Switching the ND Display to any other mode then Plan or MAP, also brings back the FPS partially, but not as it was beforethe issue occured
9) Nothing helped eliminating the issue (Weather Radar on/off, Traffic on/off, Terrain ON/OFF etc.) TILL I had the Idea to delete my set fixes completely within the FMC. That solved my issue completely, FPS back at 60 FPS!

Entering the fixes again, reproduces the severe FPS drop and latency lag. Deleting them again, all fine.

In my case it didn´t matter if the FIX Circle green lines are seen (displayed as green dotted lines within the ND set range) or not. As soon as they are entered in the FMC, the FPS drops.


I hope you have enough information to find the real cause. Thanks in advance.
I am using the latest version 2.0.36

Regards
Marcus

Edited July 7, 20241 yr by mpo910

I don't use VR, but use fixes and ranges all the time and have not had a problem.

Its not vr related. Also normal 2d display. 

2 hours ago, mpo910 said:

Its not vr related. Also normal 2d display. 

I know, but you mentioned 'VR and also 2D Display'. I am not experiencing it in 2D.

I have had no problems using ETOPS range rings (1200+nm) in the 777. Weird bug.

28 minutes ago, Fiorentoni said:

I have had no problems using ETOPS range rings (1200+nm) in the 777. Weird bug.

It's very strange indeed. As soon as I "passed" the etop airport (range to it increasing instead of decreasing - aka flying further away) the issue was not reproducible anymore. 

Same thing occurred with me this morning when I woke up to find my night flight from OMDB-KSEA dropped down from a capped 60fps to 10!

Never experienced this before. I've done Europe to US, US-Caribbean and Europe to S.America in the 777 and not had an issue until last night. Not sure if this was a result of my recent update to the latest driver, tweaking settings (nvidia settings randomly resetting) or the PMDG 777 but I hope it is the latter and that I (correction-"a") fix will be inbound soon.

 

Will try again this evening on a different route and hope 

Edited July 8, 20241 yr by Coolieboy
Spelling mistake

I guess pmdg have not addressed the issue of using the EFB moving MAP in full screen mode. It drops the fps to 12 from solid 30.

On long haul flights.

 

Once changing to arrival charts.

All was good with fps.

 

Mike