New windows appeared really slow when using draw_geometry() function (Python)

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### My Question

Hi there,

I was trying to run the draw_geometry() method with demo files and my own data, but the new windows take really long time (about 30 seconds) to display and show a simple point cloud. I saw a similar question at https://github.com/isl-org/Open3D/issues/2706, while someone responded that the bug was fixed in 0.11.2. However, I am currently using the new version 0.15.1 but still facing this problem.

- Operating system: Windows 11 Home
- Python version: 3.8.13
- Open3D version: 0.15.1
- Is this remote workstation?: no
- How did you install Open3D?: pip