Sudden FPS drop in Cemu BOTW caused by unknown monster only



  • Using latest Cemu 1.26.2f with AMD Radeon HD 7800, I get a solid 27-30 FPS with the default settings. But whenever Link is facing in the direction of this monster (looking south from Riverside Stable on Hyrule Field), there is a sudden drop to an unbearable 5-10 FPS, which lasts until the camera is moved away from it.

    Also, the monster seems bugged somehow, because it barely moves in a sluggish back-and-forth, senseless fashion. I'm attaching the Graphic Packs settings as well. Those OpenGL GPU workarounds don't have any effect. Forcing Vertical Sync and enabling Triple buffering as all youtubers suggest doesn't help either. Any ideas will be greatly appreciated and properly upvoted, thanks. If you know the monster's name, please let me know so I can perform a more specific search for this issue.

    Ps. please avoid suggesting to buy an RTX 3080 card to deal with this glitch; I know my Radeon is quite old but it works perfectly fine except for that little guy in the screenshot.

    BOTW FPS drop Hyrule Field

    CEMU Graphic Packs

    AMD Radeon HD 7800 Global Settings

    This is the HW monitor when this monster appears:

    Open Hardware Monitor



  • The solution was to switch to Vulkan API instead of OpenGL. The drivers for Windows 8.1 do not provide Vulkan support so I had to migrate to Windows 10, which I used to avoid like the plague due to its errors. Everything runs smooth and much faster than with OpenGL now.




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