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[Critical] Extreme lag / performance problems on UEFN islands with creatures & wildlife while building enabled

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Reference ID

0bd51358-41fd-1e9b-633d-539073794ca1

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Assets

Summary

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

This can also be seen / experienced live on my map ForestZ!: 3422-8734-7108 (Edit: had to disable building on the island temporarily to lower the lag)

Expected Result

No lag as this has already worked without any performance issues before!!

Observed Result

Extreme server lag spikes

Platform(s)

windows

Island Code

3422-8734-7108

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