Enabling AllowIncrementalReachability causes freezes in LevelStreaming

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1

Enabling AllowIncrementalReachability causes LevelStreaming to freeze.

At first, INT32_MAX was set in LowMemoryPendingPurgeCount, which I thought was too high, so I set it to half the value, which temporarily improved the situation.

However, now the game keeps freezing regardless of these settings.

There is a warning in the log regarding the LevelStreaming process, but I don’t know what the problem is.

Should I try to lower the value of LevelStreamingLowMemoryPendingPurgeCount?

If you have any solutions, I would appreciate it if you could let me know.

[2026.02.15-03.55.03:065][313]LogLevelStreaming: Warning: Couldn't find ULevel object in package '/Game/Maps/Area05_WP/_Generated_/1ZMT4XPS2KQPWTHPY7H0LXZ4A'
[2026.02.15-03.55.03:065][313]LogLevelStreaming: Warning: Couldn't find ULevel object in package '/Game/Maps/Area05_WP/_Generated_/C120CUG2G3TX5A5KCZIINTLWN'
[2026.02.15-03.55.03:065][313]LogLevelStreaming: Warning: Couldn't find ULevel object in package '/Game/Maps/Area05_WP/_Generated_/6NFU0AWR6MYIN3NM9Q2JEZWSC'
[2026.02.15-03.55.03:092][314]LogLevelStreaming: Warning: Couldn't find ULevel object in package '/Game/Maps/Area05_WP/_Generated_/1ZMT4XPS2KQPWTHPY7H0LXZ4A'
[2026.02.15-03.55.03:092][314]LogLevelStreaming: Warning: Couldn't find ULevel object in package '/Game/Maps/Area05_WP/_Generated_/C120CUG2G3TX5A5KCZIINTLWN'
[2026.02.15-03.55.03:092][314]LogLevelStreaming: Warning: Couldn't find ULevel object in package '/Game/Maps/Area05_WP/_Generated_/6NFU0AWR6MYIN3NM9Q2JEZWSC'
[2026.02.15-03.55.03:118][315]LogLevelStreaming: Warning: Couldn't find ULevel object in package '/Game/Maps/Area05_WP/_Generated_/1ZMT4XPS2KQPWTHPY7H0LXZ4A'
[2026.02.15-03.55.03:118][315]LogLevelStreaming: Warning: Couldn't find ULevel object in package '/Game/Maps/Area05_WP/_Generated_/C120CUG2G3TX5A5KCZIINTLWN'
[2026.02.15-03.55.03:118][315]LogLevelStreaming: Warning: Couldn't find ULevel object in package '/Game/Maps/Area05_WP/_Generated_/6NFU0AWR6MYIN3NM9Q2JEZWSC'

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2

If you enable the -DisableGarbageElimination option, the freeze will stop, but this does not solve the problem.

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3

Hello!

The incremental reachability is currently an experimental feature that was only validated on a single threaded server targets. It is recommended to avoid using it in a normal game target at this moment.

Regards,

Martin

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4

Thank you!

So this feature is not recommended for game targets. I didn’t know that.

I couldn’t find any information about that anywhere, so this is helpful.

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