This is a very critical issue for big open-world maps that rely on creatures and buildings as a gameplay element as it will cause players to leave much earlier due to the performance impact!!
On a big island with creatures/wildlife spawning recently, the server has huge performance problems.
This worked perfectly before and only recently started to reappear. I think this has been patched before and might have been reintroduced accidentally with one of the latest Fortnite updates.
My best guess would be that this has to do with the navmesh for aI pathing being altered by placing builds by a player.
When a player places a build the game hangs for a small amount of time.
In my open-world map ForestZ I had a perfectly working build. When updating this error occurred there as well. On a different open-world map I made this error occurred already from the start.
Playing the private build of that version of ForestZ that was working also has these issues and all the new private/public builds have it as well
I have tested removing creatures/wildlife and it 100% solves the performance issues so this is the cause!
Steps to Reproduce
Make a big map with complex landscapes and obstacles (trees, buildings, etc).
Add creatures and wildlife and enable the building
Start the game, wait for creatures to spawn (Already laggy), and then place builds.
You will notice a big delay/lag spike
Expected Result
No lag as this has already worked without any performance issues before!!
Yeah its probably the recalculation of nav meshes on the fly. Sadly if a player places fortnite builds while playing this always affects navigation so this is probably what is causing it
Another one with the path being updated and rubberbanding:
Removing the creatures eliminates 100% of the lag. It feels like the updating of the navmesh of the island is causing the server to lag (Maybe the nav mesh is updated in the main thread of the server instead of asynchronously / parallel which causes the problems)
Please reopen! Also if anyone has found a workaround for this other than disabling the building completely please drop it in here as this decreased my average playtime by 5 minutes and had already been fixed in a previous version of Fortnite
Little update on this topic: The rubberbanding also occurs on a newly created project with a new flat landscape and default material and a bunch of creature / wildlife spawners placed when building a few wooden ramps while the game is started.
When replacing the landscape with a world grid cube it does not cause rubberbanding so the lanndscape is definietly involved in this.
Updated Easier steps to reproduce:
Create new blank project
Create new landscape with jungle chapter 4 material
Place a bunch of creature and wildlife spawnners with default settings
Start game and build a few wooden ramps near the creatures
Update 3: New project did the same - same result. STill rubberbanding
But when placing a ramp in edit mode and starting the game with the ramp still beiing there it did not rubberband. I have the suspicion this occours only on worlds that do not use any props / bulidings on the on the normal fortnite grid and only use build to prop. My current suspicion is if you do not have at least 1 structure on the structural grid it will create it at runtime causing huge lag
Update 4: Tested back on my main project building a ramp in edit mode and starting the game then building (So the suspicion for the cause has to be wrong) => no success , still rubberbanding
Update 5: After testing removing the landscape from my main project it still did not fix the rubberbanding when building. Only removing creatures so far has removed the rubberbanding. I also tried removing all verse devices which changed nothing and will now go on removing all devices type by type as well as props
Video: Removed all landscape, all verse device, many props and device but it is still happening
Update 6: After deleting nearly everything besides the default world grid cube floor and 5 creature spawners the rubberbanding goes away => Conclusion: when either removing most of the map the lag goes away of leaving all of the map and only removing creature spawners / wildlife it is clearly the creature / wildlife spawners that is the cause in combination with props, landscape and other devices
This is the same bug that has been around for months now that occurs when any animations play such as from sequencers, airdrops, mantling, prop movers, vehicles. I assume its the same with building as there are animations playing (networked ones).
Unable to make maps with creatures for a few months because of this. @Flak
Yes world partitition is enabled Will send you the logs as DM
Also just tested and still happening as of 28.20.
Logs do not seem to have any indicator that could cause the bug. I am still pretty sure the lag / rubberbaning is caused by AI Navmesh creation / adjustment.
As the player is building the AI has to check for a new path , the navmesh changes which causes the stutter / rubberbanding
The lag is more obvious in Private/Publish version than Launch sessionâs.
When I wait like 5-10min. after starting the game, I can build normally though.
