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simply moving the render window is terribly slow
Confirmed, NormalPublicBUG

Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: AMD Radeon HD 7600M Series ATI Technologies Inc. 4.5.13422 Core Profile Context 0

Blender Version
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-01-08 05:34, hash: rB010c551257d5
Worked: (optional)

Short description of error
with more complex scenes (such as for example blenderman file https://cloud.blender.org/p/gallery/57e5084f0fcf294119c5055c) once you render an image and you have eevee in render preview mode, moving the render window becomes very slow, probably because eevee returns to refreshing the previw render without needing it.

Exact steps for others to reproduce the error
see the video

Event Timeline

Jeroen Bakker (jbakker) changed the subtype of this task from "Report" to "Bug".

Confirm. Seems that the UI received a redraw event. I will file it as a bug, but needs feed back from the UI developers. Note issue is not related to the render engine as it happens for any render engine. it is just more noticeable in eevee as it uses the most resources for updating the viewport.

First found bad commit is

rB340b9c1dfc6e: Fix missing clear of ID types tags

thanks Jeroen ๐Ÿ™, i feared it would pass as known issue

Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Wed, Jan 15, 1:08 PM