How to Stop DerivedDataCache Maintenance ?

General Feedback & Requests
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1

When Unreal Engine 5 starting it using %100 HDD for at least 15-30 min. and when i work on projects its repeating same process in time. I monitored disk activity and looking like its doing something about cached files. At the end it shows “LogDerivedDataCache: C:/Users/xxxx/AppData/Local/UnrealEngine/Common/DerivedDataCache: Maintenance finished in +00:31:22.329 and deleted 0 file(s) with total size 0 MiB” kind messages. I dont want to delete cache cause shader compiling is torture to me. How can i stop this maintenance process ?

2

Same issue here. It takes 10 minutes for me to start a blank level.

3

copy default settings for Local and Shared variables from C:\your engine path\Engine\Config\BaseEngine.ini
under section [InstalledDerivedDataBackendGraph] for launcher build OR [DerivedDataBackendGraph] for source build

add it to your DefaultEngine.ini under same section then change/add : DeleteUnused=false or if you want change it in base config :person_shrugging:

so in DefaultEngine.ini those should look like :

; ...

[InstalledDerivedDataBackendGraph]
Local=(Type=FileSystem,   DeleteUnused=false ,  PurgeTransient=true, UnusedFileAge=34, Path="%ENGINEVERSIONAGNOSTICUSERDIR%DerivedDataCache", EnvPathOverride=UE-LocalDataCachePath, EditorOverrideSetting=LocalDerivedDataCache)
Shared=(Type=FileSystem,   DeleteUnused=false ,  UnusedFileAge=10, FoldersToClean=10, ConsiderSlowAt=70, Path=?EpicDDC, EnvPathOverride=UE-SharedDataCachePath, EditorOverrideSetting=SharedDerivedDataCache, CommandLineOverride=SharedDataCachePath)
1 Like
5

Hello, I have the same problem but when I add the deleteUnused section and everything else the message of maintenance stop to appear but the engine keep blocking in the same part getting stuck. I dont know if it just need time but I dont think so I let the packing for to long and still ‘block’. Any help?

6

In 5.4.4, it seems all instances of DeleteUnused are already set to false by default, but that setting only affects the Shared DDC cache, not the Local one.

So inside the BaseEngine.ini file (located in C:\Program Files\Epic Games\UE_5.4\Engine\Config) I used Find and Replace (in the Notepad++ application) to change all instances of

DeleteOnly=true

to

DeleteOnly=false, DeleteUnused=false

(be sure to include the comma and space after DeleteOnly=false)

and then I deleted the duplicate “DeleteUnused=false” from line 2666.

I also disabled the UDP and TCP Messaging plugins, which may have been the true cause for the occasional (but constant) harddrive activity. Of course, also make sure you disable the Telemetry plugin, which is the MAJOR culprit for constant harddrive activity on Begin Play and other performance issues.