Massive memory usage increase after conversion of an island from Creative to UEFN

General Issues and Bug Reporting
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Summary

I’m migrating my island from Creative to UEFN with the intention of improving resource efficiency, but on initial import the memory consumption has skyrocketed from about 94k to 188k when live editing. Memory calculation tool results range from 134k to 170k+.

I’ve enabled streaming and tried playing with cell size and loading range. No noticeable impact to the memory usage.

I have a lot of devices, but everything behaved fine in Creative. I’m assuming the main problem is that this world is now not behaving like the thermometer island (the Grid one) that it used to be. Other than enabling streaming and such that I already tried, I’m not sure how to account for that.

The map is published (from Creative on PS5) as The Builder’s Arena with map code 5123-0309-0391.

I mentioned there are a lot of devices. In particular the guard customization mechanic is supported by (currently) 551 guard spawners each accompanied by a stat counter, character device controller, and switch. I’ll include a copy of some memory calculation results below.

Thread created at @flak’s request here: Memory Change after Convert? - #7 by Flak

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Memory

Steps to Reproduce

If you folks (Epic engineers) have access to grab a copy of my island (code attached to this ticket), I’d suggest just taking that and opening it UEFN. Then running a memory calculation or observing a live session.

Otherwise, here’s my best guess:

  1. Create an island using the Grid template.
  2. Add a large number of guard spawners (and other devices maybe)
  3. Repeat until memory consumption is up to approximately 94k
  4. Save the map. (I’m assuming publishing is unnecessary)
  5. Open the map in UEFN to convert it there
  6. Run a memory calculation and/or live sessiont to observe the resource consumption

Expected Result

I would expect that with the same devices and island content the memory consumption would be approximately the same in UEFN as it was in Creative.

Observed Result

Memory usage jumps from 94k to well over 130k (anywhere from 130k to 170k+)

Platform(s)

Creative on PS5
UEFN on Windows 11

Island Code

5123-0309-0391

Additional Notes

I know this one may be difficult to reproduce, so if anyone dives into it and tries their best it I appreciate it. I am, in the mean time, essentially trying to rebuild the whole thing, but I’d sure love to not have to do that.

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I experienced this once when i converted 1 map from 1.0 to uefn. I have never converted another due to the amount of issues and unorganized things.

What i did find is in creative it must do something to devices like the item spawner/placer/granter as in creative every copy is low yet in a converted uefn island everything was its own full memory allocation so the amount of memory on the same devices was through the roof.

I found no way to fix my issue as like i said i believe the creative 1.0 version of these devices acts differently to uefn. This has been raised numerous times and its always replied as working as expected by epic so idk what to tell you.

Anyways that was my experience with the same issue.

1 Like
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That’s interesting about the item placers. I have quite a few of those (and several granters), so maybe those are causing havoc too. One oddity I saw is that my item placers for the Shockwave Hammer takes up a ton of memory compared to others.

So with the map that you converted, did you end up rebuilding it from scratch in UEFN?

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I deleted a lot of old things i didnt need and i made space but it wasnt ideal.

Any further project you create i advise you do direct in uefn as the memory thing is weird when converting especially with the item devices.

You can look into world streaming/data layers to save memory on anything but devices pretty much so this may help you cut down memory without having to prune too much.

If you dnt understand what these things are i can find vids on yt for you