Summary
Since the latest Fortnite update, my island is experiencing severe server lag when a “Floor is Lava” system activates.
The lava is moved using a Cinematic Sequence device (prop moving upward) combined with a Damage Volume.
Before the update, this system worked smoothly with full lobbies (up to 32 players).
Now, when the lava begins rising, the server starts lagging heavily.
Older published versions of the map (which previously ran fine) are now showing the same issue.
This suggests a change in server-side replication or actor movement handling introduced in the latest update.
Please select what you are reporting on:
Unreal Editor for Fortnite
What Type of Bug are you experiencing?
Stability
Steps to Reproduce
- Join the island in a public matchmaking session.
- Wait until the lava sequence begins.
- Observe server performance as the lava starts moving upward.
Expected Result
The lava rises smoothly and the match continues normally, as it did before the update.
Observed Result
As soon as the lava starts moving:
Server performance degrades significantly.
Players experience server lag / stuttering.
Issue persists while the lava is moving.
Removing the lava prop and Damage Volume (or the sequence device) completely resolves the issue.
Platform(s)
PC, PS4/PS5, Xbox, switch, mobile
Island Code
7343-6357-0516
Additional Notes
-Lava is moved using a Cinematic Sequence device.
-Damage is applied using a Damage Volume.
-Issue does NOT occur in UEFN edit sessions.
-Issue ONLY occurs in public server environments.
-Previously published versions of the island now also reproduce the issue.