mojira.dev
MCPE-166745

FPS is capped at double the screen's refresh rate when v-sync is disabled

Summary:
When v-sync is disabled, the frame rate is capped at double the screen's refresh rate. My screen's refresh rate is 144hz, so the frame rate is capped at 288. If I change the refresh rate to 60hz, the frame rate will be capped at 120.

Steps to Reproduce:

  1. Navigate to %userprofile%\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftpe

  2. Open options.txt and set gfx_vsync to 0

  3. Launch Minecraft and observe the frame rate

Observed Results:
The frame rate is capped at double the screen's refresh rate.

Expected Results:
The frame rate should be uncapped.

System Specs:
OS: Windows 11 Home
CPU: Intel Core i5-11400H
GPU 0: Intel UHD Graphics
GPU 1: NVIDIA GeForce RTX 3060 Laptop GPU
RAM: 16GB

This issue occurs with both GPUs and doesn't occur in Java Edition or other games. This issue also doesn't appear to occur on all systems because it doesn't occur on my old laptop.

Linked issues

Attachments

Comments 7

I have the same problem but with vsync enabled, I think it's not related to vsync

I can confirm the issue. It seems like it only affects laptops with both integrated and dedicated GPUs. The issue is renderdragon specific because it doesnt occur in the older versions with the old engine.

Can confirm this is likely specific to hybrid graphics laptops running with intel igpus, doesn't occur on AMD.

edit: typo

Still present in 1.21.0

Still present in 1.21.2

This happens to me too and i got the MSI gf66. This might be to do with optimus and no mux switch Which has been an issue since 1.16…
I tried:
- Disabling fullscreen optimisations
- Turn off Vsync in the Nvidia control panel
- Turn off Vsync in the Intel control panel
- Turn off Vsyinc i nthe minecraft options.txt
- Installing windows 10 from 11
With all that its capped only when im in Fullscreen and still no screen tearing in either which means input lag.

I use an external monitor to help but it still doesnt get rid of the problem fully. I would prefer screen tearing over frame skipping.


I use RTSS to measure my FPS.

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Thank you for your report!
After consideration, the issue is being closed as Won't Fix.

Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.

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[Mod] OcelotOnesie

(Unassigned)

1167412

Community Consensus

Windows

1.20.20.20 Preview, 1.19.70.21 Preview, 1.19.51, 1.20.40.22 Preview, 1.20.60.25 Preview, 1.21.2 Hotfix, 1.21.60.28 Preview, 1.21.51 Hotfix

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