By 'scenery area' i'm not referring to addon scenery, rather any objects or scenery data entering the sim as we slew toward it.

...another idea is that a shader may possibly be generated as we approach the area, that can cause a little stutter but should only happen once so would indicate some kind of fault with the shaders if there are any repeating initialisation.

I think it's the default world\scenery since this problem has been there for 20 years. We didn't have OpenLC Europe etc. in those days.

My belief is that all the default scenery has a border that aligns with the PM. I don't think anything straddles it. The problem is exacerbated  by the extra scenery in the London area. I tested at 52.30N yesterday and it was nowhere near as bad.

1 hour ago, SteveW said:

...another idea is that a shader may possibly be generated as we approach the area, that can cause a little stutter but should only happen once so would indicate some kind of fault with the shaders if there are any repeating initialisation.

But Steve, we didn't have shaders 20 years ago. This is not a problem limited to P3D. I'm sure it will also be there in FSX, FS2004, FS2002 etc etc.

The possibility of some kind of shader problem was just an idea Ray, the scenery is still the main suspect, not the meridian.

...there's basically no reason why you couldn't have experienced some kind of mathematical situation or other some years ago with older products but there's most likely nothing wrong in that area now so throwing in other possibilities is what's required to break down a problem.

41 minutes ago, SteveW said:

The possibility of some kind of shader problem was just an idea Ray, the scenery is still the main suspect, not the meridian.

The only common theme to the problem in P3D and FS98 is the base world scenery. I suspect that is pretty much unchanged.

It was possible in those days to analyse BGLs which showed their coverage by lat / lon. Until we can get hold of a similar tool a lot of this is just conjecture but it would be a huge coincidence if it wasn't linked to crossing the prime meridian. In my tests last week slewing from EGLC to EGLL I had no other stutters as bad as that. Even over other parts of central London or Aerosoft's Heathrow Xtended.

After hours of slewing I couldn't reproduce it. So naturally I'd be looking for some other reason, and fact is if you delete your shaders and start the sim it will stutter for a couple of minutes. However, it's not about whether there are other ways of getting stutter, but rather if it's a coincidence of scenery lining up along a lat or lon then there will be loads of that all over the place depending on where you fly most.

...turn off vehicular traffic, in the M25 area there could be a snarl up. 

Fair enough Steve. If you can't replicate it you can't. It doesn't bother me during my flight from Oslo to EGLL. I only noticed it because of my AM slewing across London test.

The M25 isn't a motorway, it's a car park!

19 minutes ago, SteveW said:

...turn off vehicular traffic, in the M25 area there could be a snarl up. 

I have vehicle traffic off. And no boats.

Weird I cannot edit my post it opens a blank window without my message in it!

If it happens again, open the edit box in a separate window. I have the same problem, and this seems to be a solution!

On 19/5/2017 at 1:33 PM, Ray Proudfoot said:

The M25 isn't a motorway, it's a car park!

 

 

On 19/05/2017 at 9:35 AM, 777200lrf said:

I get this cruising over London approaching CLN and once I pass it goes away. Very bad 5 second pauses within 5-10 miles of CLN and once I am outbound, the stutters and pauses go away. This is at cruising altitude FL330 and above. I thought it was an Orbx Vector or OpenLC Europe problem interesting that this is passing a time zone if that is why.

I get the exact same problem and exactly there. Departing SEN airport bound for either let's say Amsterdam or Norwich, near Clacton I get these long stutters every 10-15 seconds. Nowhere else. I was looking for clues for ages until I came across this thread today. Good to know it's the Prime Meridian. I initially suspected the UK2000 Southend scenery or ORBX OpenLC EU and/or ORBX FTX Global/Vector but since I do not have anything like this anywhere then it's really a mysterious issue. I am on Prepar3D V4.

7 minutes ago, kityatyi said:

I get the exact same problem and exactly there. Departing SEN airport bound for either let's say Amsterdam or Norwich, near Clacton I get these long stutters every 10-15 seconds. Nowhere else. I was looking for clues for ages until I came across this thread today. Good to know it's the Prime Meridian. I initially suspected the UK2000 Southend scenery or ORBX OpenLC EU and/or ORBX FTX Global/Vector but since I do not have anything like this anywhere then it's really a mysterious issue. I am on Prepar3D V4.

If you're departing Southend and heading east then you're nowhere near the prime meridian. Check an atlas.