Low FPS with an empty scene on an Android device

[stdgn]

Godot version

4.0 rc5

System information

Xiaomi redmi 9T 64GB

Issue description

There is only one camera in the scene and it shows the blank screen. When I tested this on android, it gives 22 fps. The phone I tested is the Xiaomi redmi 9T 64GB

(All settings are default in Godot)

Steps to reproduce

N/A

Minimal reproduction project

N/A

[Zireael07]

Is this Vulkan or GLES? What is the resolution of your device?

[stdgn]

Emin değilim ama OpenGL

phone resolution: 1080x2340

[YuriSizov]

For the record, the System information section is for the device that exhibits the problem, not for your work PC.

[stdgn]

How can I do it?

[YuriSizov]

You don't need to do anything, I've already edited your report. This is just for your information in future.

[Calinou]

Glow is enabled by default in the preview WorldEnvironment, and it's quite performance-intensive on integrated/mobile GPUs. Try adding a new WorldEnvironment based on the preview environment, then disable glow in the inspector when editing its Environment resource. #49736 disabled glow by default at some point, but we didn't reach an agreement on it so it wasn't merged for 4.0.

You can also try reducing 3D rendering resolution by setting Rendering > Scaling 3D > Scale to 0.5 in the advanced project settings. This can potentially help a lot in bandwidth-constrained scenarios, which includes mobile GPUs.

Note that in general, we currently expect the Forward Mobile renderer to run in a suboptimal manner on anything but high-end mobile GPUs currently (flagship devices + iOS devices). The Compatibility renderer is expected to run better on Android for now.

[stdgn]

So is it enough for the desktop right now or should we wait for the next versions?

[stdgn]

Is this normal?

[Zireael07]

The fact that you get much higher fps with scaling 0.5 is normal. The way it looks... not sure

[Calinou]

3D scaling isn't supported when using the OpenGL renderer yet, only Forward+ and Forward Mobile.

When using the OpenGL renderer, you'll have to use the viewport stretch mode in the project settings to scale both 2D and 3D rendering, or use a SubViewport with 3D nodes as children (with a size override) to scale only 3D rendering. This is similar to what you had to do in 3.x for resolution scaling (though the demo needs to be updated for 4.0).