Emulator Issues #12933


Bounding Box Slowdown on MoltenVK (macOS)

Added by lasers over 1 year ago. Updated over 1 year ago.

% Done:


Operating system:
Issue type:
Relates to usability:
Relates to performance:
Relates to maintainability:
Regression start:
Fixed in:


Game Name?

Super Paper Mario (rev2)

Game ID? (right click the game in the game list, Properties, Info tab)


MD5 Hash? (right click the game in the game list, Properties, Verify tab, Verify Integrity button)


What's the problem? Describe what went wrong.

Bounding Box slowdown...

Chapter 3-4 (Fort Francis)

  • to 10%~ when you entered passcode-protected elevators.

Chapter 7-2 (Underwhere Road)

  • to 50%~ only when you met Dorguy the First. No slowdowns on meeting second or third Dorguy.
  • to 10%~ when Bowser uses his fiery breath to ignite the torches to temporarily light up in (two) rooms.

Chapter 7-4 (Grambi's Temple)

  • to 65%~ when you use Luigi's special move (super jump) anywhere in the area where there are an epic fight between two armies in front of the temple.

What steps will reproduce the problem?

Gist explained above.

Is the issue present in the latest development version? For future reference, please also write down the version number of the latest development version.

Not applicable.

Is the issue present in the latest stable version?


If the issue isn't present in the latest stable version, which is the first broken version? (You can find the first broken version by bisecting. Windows users can use the tool and anyone who is building Dolphin on their own can use git bisect.)

[First broken version number here (if applicable)]

If your issue is a graphical issue, please attach screenshots and record a three frame fifolog of the issue if possible. Screenshots showing what it is supposed to look like from either console or older builds of Dolphin will help too. For more information on how to use the fifoplayer, please check here:

[Attach any fifologs if possible, write a description of fifologs and screenshots here to assist people unfamiliar with the game.]

What are your PC specifications? (CPU, GPU, Operating System, more)

MacBook Air (M1, 2020)

Is there anything else that can help developers narrow down the issue? (e.g. logs, screenshots,
configuration files, savefiles, savestates)

Not applicable.

Related issues 1 (0 open1 closed)

Has duplicate Emulator - Emulator Issues #12016: Super Paper Mario - macOS bounding box support sucks.Duplicate

Actions #1

Updated by JosJuice over 1 year ago

  • Description updated (diff)

Amending the description by request.

Actions #2

Updated by JosJuice over 1 year ago

  • Relates to performance changed from No to Yes
  • Operating system OS X added
  • Operating system deleted (N/A)
Actions #3

Updated by JMC4789 over 1 year ago

  • Status changed from New to Accepted

Can confirm with a few users on the discord that it is ridiculously slow to the point of being unplayable in some areas.

Actions #5

Updated by TellowKrinkle over 1 year ago

For M1 users, this has been fixed (or as fixed as it'll ever be, translation layers will always have some trouble with the kind of CPU-GPU synchronization bbox requires) by the updated MoltenVK. Please rerun with a new dev build and verify this.

For Intel users, there's a second issue, which I've reported to MoltenVK. For the elevator scene on my Radeon Pro 5600M, frame rates have gone from 2.4fps to 9fps, but should be able to reach 16fps with that issue fixed, putting it ahead of DX11 and DX12 (but behind Windows Vulkan, Windows OGL, and Metal).

Actions #6

Updated by JMC4789 about 1 year ago


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