[Bug 57049] New: Periodic stutter when playing A Plague Tale: Requiem (GOG version)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57049

Bug ID: 57049
           Summary: Periodic stutter when playing A Plague Tale: Requiem
                    (GOG version)
           Product: Wine
           Version: 8.21
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 76904
  --> https://bugs.winehq.org/attachment.cgi?id=76904
Output with +timestamp,+loaddll

When playing the GOG version of A Plague Tale: Requiem (version 20230706_1126),
the game stutters exactly every 15 seconds. Earliest wine version tested is
8.21, bug still present in 9.14.

Steps to reproduce:
- Launch the game
- Press a button to start the dialog of loading a save file
- Notice a FPS stutter every 15 seconds when in a GPU bound scenario

Notes:
- The stutter occurs only after inducing the savegame loading dialog. Staying
on the start screen without pressing a button then all is well
- The save files are encrypted and stored in a GOG specific folder
(drive_c/users/<username>/AppData/Local/GOG.com/Galaxy/Applications/55243620139303375/Storage/Shared/Files/),
presumably created by the Galaxy64.dll in the main game folder (deleting it
crashes the game on startup).
- Replacing secur32.dll and sspicli.dll with their native Windows version,
fixes the stutters (only replacing one or the other does not).
- There are no reports about this for the Steam/Proton version (AFAIK)

Console output created with +loaddll,+timestamp, otherwise nothing would show
up at the moments of stutter.