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Eevee preview nodes with drivers performance drop Round 2
Confirmed, NormalPublic

Description

this is extend of previos task T71214
System Information
Operating system:Windows 10
Graphics card: GeForce GTX 1060

Blender Version
Broken: Blender 2.81 Beta aff6446e064f and 2.82 Beta 092deb88b074
Worked: 2.8

Short description of error
Complex shader with large amount of math nodes and with drivers slow down performance
in 2.8 60 fps
in 2.82 30 fps

Exact steps for others to reproduce the error
Create material with 30 node groups contains 30 math nodes, add driver to shader. Set viewport to material preview and watch performance droping

Event Timeline

Danila (Afir) renamed this task from Eevee preview nodes performance drop Round 2 to Eevee preview nodes with drivers performance drop Round 2.Thu, Feb 6, 9:13 AM
Danila (Afir) created this task.
Danila (Afir) updated the task description. (Show Details)
Danila (Afir) updated the task description. (Show Details)
Jacques Lucke (JacquesLucke) changed the subtype of this task from "Design" to "Report".Thu, Feb 6, 10:01 AM
Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Thu, Feb 6, 9:42 PM

This issue does not seem to be limited to drivers, even if I key value of value node, performance is the same.