Abyssal viewport rendering performance for textures on Intel Iris Plus graphics 10th gen i7 (1065g7)

Hi ! I’m getting really abyssal performance and crashes for “rendered” view with Intel Iris Plus integrated graphics (OpenGL) on a 10th gen i7 laptop.

It is far worse (think at least 10 times slower when it doesn’t crash alltogether) than the fairly usable 5 years old Intel UHD 520 integrated graphics on my older laptop.

Other modes of the viewport, ghosted, shaded etc work fine.
Simple stuff without textures in rendered mode works fine.

(note that Blender have also experienced performance issues for this particular GPU :
⚓ T71287 Blender Running extremely slow on Intel IRIS and Windows . Seems they have been able to code around.)

My Win 10 and drivers are up to date, see detail below.

Does anyone have a workaround ? Or does McNeel have this issue on the radar ?
Or will i have to look for a light laptop for which cleaner drivers are available (ouch, complicated from Argentina these days without planes and with currency restrictions … ) ?

Many thanks to all !!
Have a nice day !


OS Name Microsoft Windows 10 Pro
Version 10.0.19042 Build 19042
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Manufacturer Dell Inc.
System Model XPS 13 7390 2-in-1
System Type x64-based PC
System SKU 08B0
Processor Intel(R) Core™ i7-1065G7 CPU @ 1.30GHz, 1498 Mhz, 4 Core(s), 8 Logical Processor(s)

Rhino system info inc graphics driver:
Rhino 7 SR5 2021-4-10 (Rhino 7, 7.5.21100.03001, Git hash:master @ 2cd158094b595f6400479d7cbe511454b6149527)
License type: Commercial, build 2021-04-10
License details: Cloud Zoo

Windows 10.0.19042 SR0.0 or greater (Physical RAM: 16Gb)

Computer platform: LAPTOP - Plugged in [20% battery remaining]

Standard graphics configuration.
Primary display and OpenGL: Intel(R) Iris(R) Plus Graphics (Intel) Memory: 1GB, Driver date: 3-30-2021 (M-D-Y). OpenGL Ver: 4.6.0 - Build
> Integrated graphics device with 3 adapter port(s)
- Windows Main Display is laptop’s integrated screen or built-in port

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On

Anti-alias mode: None
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High

Vendor Name: Intel
Render version: 4.6
Shading Language: 4.60 - Build
Driver Date: 3-30-2021
Driver Version:
Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24 bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 1 GB