Extreme lag when rotating the camera to a negative perspective on Intel Iris Xe IGPs on Windows (D3D12)

[dpnnl]

Tested versions

Reproducible: 4.6 stable and 4.6.1 RC1
Non-reproducible: 4.5

System information

Godot v4.6.1.rc1 - Windows 11 (build 26200) - Multi-window, 2 monitors - Direct3D 12 (Mobile) - dedicated Intel(R) Iris(R) Xe Graphics (Intel Corporation; 32.0.101.7084) - 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz (8 threads) - 15.78 GiB memory

Issue description

The editor's FPS drops drastically every time I rotate the camera towards the ground – looking upside down.

This performance drop affects the entire Windows 11 system.

Steps to reproduce

Simply rotate the editor's camera to negative/upside-down positions.

Minimal reproduction project (MRP)

test.zip

[Oblepikha]

I have the same issue on Intel Iris Xe. The problem disappears when I disable the view grid

[ryevdokimov]

I can't reproduce, so the problem does seem specific to Iris Xe:

Godot v4.7.dev (8f2206ac2) - Windows 11 (build 26200) - Multi-window, 1 monitor - Vulkan (Forward+) - integrated AMD Radeon 780M Graphics (Advanced Micro Devices, Inc.; 32.0.22024.4008) - AMD Ryzen 7 PRO 8840HS w/ Radeon 780M Graphics (16 threads) - 27.66 GiB memory

[zacharyhevey-cloud]

Still occuring in 4.7-dev.

Godot v4.7-dev - Windows 11 (build 26200.7840) - Multi-window, 2 monitors - Direct3D 12 (Mobile) - Intel(R) Iris(R) Xe Graphics (Intel Corporation; 32.0.101.7077) - 13th Gen Intel(R) Core(TM) i7-13700H (2.40 GHz) - RAM: 32.0 GB (31.7 GB usable)

Recording.2026-02-26.103555v2.mp4