Looks like a bomb has gone off.
Please highlight in a Dev session so it can be revisited.
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Asobo and MS are well aware of the issues and have been for a long time. Jorge said months ago that he would like to see London redone properly but focus has now probably shifted to MSFS2024. Itās a real shame that they couldnāt get such a big and important city right.
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What do you have your TLOD/OLOD set to, and also which platform, which may answer the first question?
Regarding new data, my assumption is the data could be used by either sim, so there is no reason to think that new London data will come with 2024 specifically, and not 2020. It would be an odd thing to hold back as well. Though I would guess that the product managers are going to want a nice long list of bullet points for 2024 to encourage users to upgrade. Neo-London is probably not going to be one of them. 
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I noticed a few months ago that London had definitely improved without any notification, posts here about it, fanfare etc etc.
Last time I flew there it looked way better than the previous times Armageddon. The data is there but the LODs seemā¦ erratic?
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i had a similar problem, and it was suddenly fixed
i think there is a bug in the tlod setting
sometimes it doesnt reach the level at wich is set
yours look like its set at 10
I think i saw this as well happening live and took picture
I posted in another topic
I expect Ghengis has let London get like that nowā¦
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Note that the low-resolution LOD levels on the London photogrammetry are notoriously bad, making this area particularly subject to visible problems when mysterious network? server? graphics? something? issues causes things to be slow to load for hard to diagnose reasonsā¦
Yep.Londons not what it once was!
As a relative newcomer, I never flew with the early builds, so canāt make a comparison with them, but this is what Iām seeing on my PC with v1.37.11.0. Not the nuclear wasteland that the OP posted above, but some of the high-rises & especially the cranes look pretty bad if you fly too close to them. Nothing to do with this build, of course.
The sim was pulling down around 50 Mbps during the flight over the city:
Then there are the trees. Here we are in Regentās park. Iām not sure if these are supposed to be trees, or actual sculptures commissioned by the City of London Arts Department. You never know these daysā¦ 
Partial Specs & settings:
Build: SU15B v1.37.11.0
3rd-Party Addons: None, Community Addons: None
Flight configuration: Multiplayer: All Players. Traffic: Live, Weather: Preset Clear Skies
i7-12700K (No overclocking), 32 GB 5200 MHz DDR5 CL40, Arc 770 (16GB, v31.0.101.5333).
Graphics Tab: TAA, Render resolution 1700x960 @ 125, AMD Fidelity - 150, VSync - On, FRL - 100% MRR (60 Hz), HDR10 - Off, DX12B, TLOD @ 250, OLD @ 200, Motion Blur - Off, Other settings - all Ultra
Traffic Tab: Aircraft Traffic Type - Real-Time Online, Slider Settings - All 100%, Generics (AI, MP) - Both Off, Show MP in Vicinity - On, Traffic Variety - Ultra
Data Tab: Data Connection: All six options - On, Data Limit - Off, Bandwidth - Unlimited, Rolling Cache - Off
Developers Tab: Developer Mode - Off
MSFS Version: MS-Store, Standard, plus All WUs
Cranes will always look bad because they are a non-solid surface that the PG technology can see through.
The beta included files for the UK world update. Iām not sure if itās that or maybe the UK regional scenery updates (payware) but the whole UK looks so great, itās the only place I have been flying the last 2 weeks. Flying out of the London City airport (which is downtown) is gorgeous!
Whoās Genghis?
āGhengisā, sorry?
Really? the PG in London is very bad for meā¦ nuclear apocalypse-likeā¦massive glitches and scenery popping all over the placeā¦ very FPS un-friendly. As opposed to cities like Baltimore for instanceā¦, that look gorgeous and are very performance optimized. I dont know what happened to london.
I heard rave reviews of the improved photogrammetry in London and couldnāt wait to try it out.
I was finally able to get into my game by going offline first and then online, strange workthrough but worked. Anyhow, London looked very bad with photogrammetry loading in bits and pieces within a few hundred metres around my aircraft.
At height, it looks like large āpatchesā of photogrammetry is popping in and out of view. Tried three different locations in London and other nearby cities, same result.
Was flying over London when the UK update had just come out. It was so wonderful.
At this point, Iām really not sure if this is SU15 related or a temporary problem with Asoboās servers.
I suspect it is related to the server issues we have been experiencing over the last 48 hrs or so. Iād suggest holding off on making changes to your MSFS installation at this time. If you are still seeing the same issue in a few days, post some screenshots so we can see if we can repro what you are seeing.
Thank you, sounds good.
By the way, sorry this is not on-topic but I canāt get into the game unless I take myself offline and go back online once I arrive at the main menu.
The āchecking for updatesā screen remains stuck. Even if it does transition to the next screen, I canāt get to the main menu. Only workaround is to launch the game offline, hoping it will take me to the main menu.
Safe to assume this is due to the sever outages or server related issues Flight Simulator has been facing in the last 48 hrs or so?