I have run dual monitors on my setup for several years with no issues.  I run the Sim on my main monitor and LNM on the 2nd monitor.  I power the Sim monitor off the DP of my 3080 and the 2nd monitor off the onboard HDMI of the motherboard.  Suddenly (within the last week) if I click on LNM the FPS goes in half until I click back on the Sim.   Once I click back on the Sim the FPS goes back to normal.  Doesn't happen 100% of the time (about 80% of the time) unless I move the map on LNM...then it will always occur.  I know the FPS is actually going in half because my Sim gets real jerky.

Didn't find any similar situation on the forum and hope someone can give me some help.

10 hours ago, flytriman said:

Suddenly (within the last week) if I click on LNM the FPS goes in half until I click back on the Sim.   Once I click back on the Sim the FPS goes back to normal.

Well, nothing changed in LNM so I doubt something is wrong there. Can't you power the second monitor also from the 3080 instead of the onboard HDMI? Maybe this can help. I feed two monitors from one GPU here and disabled the onboard GPU.

I see a similar effect with X-Plane which gets jerky or stuttery if the simulator window is not active, i.e. when clicking around in LNM. Nothing I can do about this. It also appears with other applications.

Alex

Thanks Alex,

I did check with other applications and it did not.  I also checked if something had changed in my settings with the SU14 update...nothing had...however I then remembered that I had also updated the NVIDI driver at the same time.  So I checked my settings there and found Vertical Sync had been activated.  I have had that off since I purchased a G-Sync monitor some while ago.  Once I turned that OFF everything went back to normal.

Anyway...thanks for the help and all is good.

Garry

Hi Garry,

thanks for reporting back.👍
This might be helpful for other users too.

Wish you Happy Holidays!

Alex

My 5 cents here. 

I run 2 screens via my 1 NVIdia 1080. What you're describing happens to me all the time. I click on anything on my non simulator screen , it doesn't effect my simulator, but, when I get back to the simulator screen, it stutters for several seconds then calms down.

Searched about it in the internet, found discussions about the fact that the 2 screens are different resolution and also the fact that one is G-SYNC 144 Mhz and the other is not G-SYNC and is 60 MHz. I don't know if that's what happens on my side (although the resolution difference and the frequency difference are indeed true). 

I didn't try to lower my 2K screen to by 1080p and 60 MHz in order to test that, maybe I will 🙂

Or, buy another 2K G-Sync 144MHz screen and check that as well.

Anyway, I don't think it involves NVM at all. Weird your setup is like that for a long time and you never encountered it before.

Edited December 27, 20232 yr by Dbarnea

When I first started using two monitors, years ago, the popular wisdom was to plug both into the GPS.  I tried this and had a lot of trouble with low frame rates and studders.  So, one day I plugged my 2nd screen into the Onboard (motherboard) HDMI plug and everything worked much better.  That's the way I've been doing it ever since...except my 2nd screen now has a DP port so I use that instead of the HDMI port.  I run the Sim on my main screen and LNM on the second screen.  The main screen has G-Sync, which the 2nd screen does not.  Both are set for 60hz.

Garry

Edited December 28, 20232 yr by flytriman

45 minutes ago, flytriman said:

So, one day I plugged my 2nd screen into the Onboard (motherboard) HDMI plug and everything worked much better. 

Hmmm. I probably should give this a try. Maybe it fixes the stutters when XP is not active.🤔

Alex

Very interesting. You're sayin, if you're not using your 60MHz screen for games, why load it on the Nvidia card ? 

Man, never thought about that.  I will definitely try that and see what happens 🙂