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[About Cubism Editor / SDK 5.4 Alpha](Updated: July 14, 2026)

You can download the alpha installer from the dedicated forum below.
If you have any feedback regarding the alpha version, including feature requests or bug reports, please use the same forum.

Cubism Editor / SDK 5.4 Alpha Forum
https://creatorsforum.live2d.com/c/cubismeditorsdk54alpha/

[Regarding macOS Tahoe](Updated October 16, 2025)

macOS v26 Tahoe is now supported!
We advise against upgrading your macOS at this time as it may cause Live2D products not to function correctly.
Upgrading macOS can also cause you to lose your Cubism Editor license file.
Please make sure to deactivate your Cubism Editor license before upgrading the macOS.

For more details:
https://help.live2d.com/en/other/other_09/
For inquiries regarding issues with license purchases or license activation errors, please contact us through the email form.

Live2d suddenly VERY slow

katharpykatharpy
in Help
No idea why, as I've made a couple models in the past and have had no problems, but now doing most anything freezes the program and makes me wait a long time to load. Anything from copying/pasting a mesh or resizing a deformer. Saving is the worst and can take up to ~5 minutes. Also, the physics menu is practically impossible to use now and is too laggy to even see if anything is working.

I've tried reinstalling, which helped maybe a tad, but it's still so agonizing to use. I don't think it's my computer, as it's pretty high quality and new and can play pretty CPU intensive video games, so I don't know why it would suddenly just break on me.

Specs:
Cubism Editor 4.0.09
Win 10 Home 64bit
Intel i7 3.70ghz
32gb RAM
4095MB NVIDIA GeForce RTX 2060 SUPER (Gigabyte)
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Comments

  • kudo(Staff)kudo(Staff)
    Hello @katharpy.
    Thank you for your contact.
    We apologize for any inconvenience this may cause.

    Please check below.
    Is the situation the same when you use the official sample model?
    sample model：https://www.live2d.com/en/download/sample-data/

    We appreciate your cooperation.
    Thank you.
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  • katharpykatharpy
    kudo(Staff) said:

    Hello @katharpy.
    Thank you for your contact.
    We apologize for any inconvenience this may cause.

    Please check below.
    Is the situation the same when you use the official sample model?
    sample model：https://www.live2d.com/en/download/sample-data/

    We appreciate your cooperation.
    Thank you.

    No, I don't see any lag on the sample models. My file's canvas size is actually about half the size of the samples and its texture atlas is the same size and there's less parameters and physics, so I can't think of why that specific file lags.
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  • katharpykatharpy
    kudo(Staff) said:

    Hello @katharpy.
    Thank you for your contact.
    We apologize for any inconvenience this may cause.

    Please check below.
    Is the situation the same when you use the official sample model?
    sample model：https://www.live2d.com/en/download/sample-data/

    We appreciate your cooperation.
    Thank you.

    I think I see the problem, but don't know how to fix it. I see a huge difference in "Number of Interpolations in Deformers" and "Number of Interpolations in Artmesh", but I don't exactly know what determines that number and I can't find any information or documentation.
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  • kudo(Staff)kudo(Staff)
    Thank you for checking using the sample model.

    If you assign a lot of parameters to a single mesh or deformer, it may become noticeably slower.
    Please check here.
    https://docs.live2d.com/cubism-editor-manual/keyform-parent-chilid-relation/#

    Please make a copy of your files and delete "Number of Interpolations in Deformers" and "Number of Interpolations in Artmesh" little by little to see how it works. Perhaps, you'll be able to find the cause.

    If the above does not work, please send us the model file, as there may be a problem.

    [How to send a direct message]
    Click on my name, "kudo(Staff)".
    My profile screen will open. Click on [Message] in the top right corner.
    The message sending screen opens.
    Click on the icon [Attach file] and select the file.
    Click [Post Message] to send the message.
    (Please compress the file. If the file is too large to be attached, use an upload site or similar)

    We appreciate your cooperation.
    Thank you.
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