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Blender 2.8. In edit mode when you have hard scene (slow down processing) all your actions will applyes not at right moment (not at click but at moment when blender finn. caclucations)
Open, Needs Triage by DeveloperPublic


System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 560/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.35

Blender Version
Broken: version: 2.80 (sub 53), branch: master, commit date: 2019-03-30 19:37, hash: rB700346d377dd
Worked: (optional)

Short description of error
I have scene where I put a lot boolean(and not only) modificators on one objects and when I enter into edit mode all processing erally slow (each action: movement, extrusion, etc..) And problem here in next: when you doing any action (and it took time to process it) and then press mouse button to apply action affect, but! it will not memorize position of the mouse when you pressed, and still continue doing (move to the cursor) And this really anoing because you need repeat all twice or more time. Or just seating and waiting with no mouse movement at all, when it will apply action effect.
So core problem is that: in edit mode any affect will applyes not at moment when you decide but by moment when CPU will finished calculetion of movement/action and will change your action to position where is going be mouse positioned at the moment of the end calculation... something like that.

Exact steps for others to reproduce the error
Create some worcload/heavy scene. For example by a lot subdivisions and booleans at object. When each your action will be like "under water gravity" slowed down. And then try to change(extrude/move vertext / anything) boolean part that will be used as cut area in the edit mode.



Event Timeline

Brecht Van Lommel (brecht) triaged this task as Needs Information from User priority.EditedApr 1 2019, 2:39 PM

Please attach a .blend file and provide exact steps to reproduce the issue.

I create new file [not my original]. But here are it reproduce on my PC. If you PC more powerfull - you will don't see it. So please just increase subdivisions on the object [when you fill the same slowing down as in the video]
Here is how it looks like:!cLBQHIIa!UYt3WhuyBA0twL6P5J29fC5jnK7X97zjwRmbRM2c5m4
Btw, I checked it whith pressing 'Enter' key - and it works fine. But with mouse - not.

STEPS: open file. Press G to move. Press Z to lock by Z axis. Move precisely to the ~zero position by mouse. Then press mouse to finish action and then move mouse upside without waiting long time.

Brecht Van Lommel (brecht) raised the priority of this task from Needs Information from User to Needs Triage by Developer.Apr 1 2019, 4:01 PM

I can't reproduce this on my end, the file is even slower for me than in you video.

However, in you video you can see that the mouse cursor does not change right away when you left click but lingers around. On my end it changes quite fast after I left click (even if the scene is many times slower for me than in your video) so I can't get it to change position after I have clicked.

@LazyDodo (LazyDodo) @William Reynish (billreynish) can you guys see if this happens for you on Windows/Mac too?