eevee performance drop with node tree in 2.81 #70766

System Information
Operating system: Linux-4.13.10-041310-generic-x86_64-with-debian-stretch-sid 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.67

Blender Version
Broken: version: 2.81 (sub 14), branch: master, commit date: 2019-10-10 23:31, hash: f9cc51788b
Worked: (optional)

Short description of error
Maybe related to this recent issue , I have another node tree that seems to affect eevee performance quite significantly.

eevee_performance_drop_with_eevee.blend

Exact steps for others to reproduce the error

open the attached blend file in 2.80 and drag any of the principled shader's inputs, like metallic or roughness, it should be smooth
repeat in a recent 2.81 build, it should be sluggish

Added subscriber: @MACHIN3

Added subscriber: @ThinkingPolygons

Confirmed. :(

Added subscriber: @nokipaike

I also confirm on the radeon

Added subscribers: @fclem, @lichtwerk

Can confirm a performance difference.
@fclem: this expected? (I know there's changes to bump and tree traversal, but this also seems to affect trees not even connected to normal slot... but I guess the traversal runs regardless...)

Well I guess it's a duplicate of #70325 which has already been resolved. Feel free to reopen if that's still a problem. Note that the new bump mapping increase the shader/nodetree complexity so it will never be on the same level as 2.80.

Closed as duplicate of #70325

#70325 was also reported by me and seems to be resolved to me. This one here is not however. It also doesn't seem like it is related to bump, unless I misunderstand you. I can pipe the node tree into the roughness slot as well and it's just as sluggish.

It doesn't look like i can reopen this task, but I think it's very unfortunate if this slow down can't be resolved. I'll see if I can pin point the issue to any specific node or node combination in the tree.

@MACHIN3 : reading your previous comment, just checking if this is still an issue in fresh builds?

@lichtwerk Yep, still happening in 689a873029 - todays 2.82 beta, and also in eca8bae671 - todays 2.83 alpha. Thanks for following up!

Changed status from 'Duplicate' to: 'Needs Triage'

This issue was referenced by 32f0bb0523

Changed status from 'Needs Triage' to: 'Resolved'

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eevee performance drop with node tree in 2.81 #70766