Mouse Cursor poistion causes FPS drop

Development Programming & Scripting
1

I just found out that when the mouse cursor is located at around 25% on the X axis on screen, there is a significant drop in FPS for no reason whatsoever.

I could reproduce the problem on a fresh third person c++ template project:
create a BP player controller, set him as default for project, enable mouse cursor, and that’s it, the FPS drop will happen…

2

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Here is the zone( more or less ), where the FPS drop occurs…going from 120 to 70.

3

Hi Rumpelstilskin,

Unfortunately, I have not been able to reproduce this on my end. Do you have any other steps that may be involved in recreating this error that I can take?

4

Actually, I am dealing with the somewhat same issue, that if I keep my mouse still, the scene runs in 120fps. But if I start moving my mouse around, even when Ejected from the game, the frame time almost doubles on my Unit Graph, both Game Time and GPU Time.

EDIT: It should be noted, that it does so as well in Ejected mode, so it is not caused by ray tracing etc. but rather engine or editor related.

EDIT: After profiling, I tracked the problem down to “ProcessMouseMove” in Slate Tick Time

5

Hello twicfall,

I have a few questions for you that will help narrow down what issue it is that you are experiencing.

Quick questions:

  1. Can you reproduce this issue in a clean project?
  2. If so, could you provide a detailed list of steps to reproduce this issue on our end?
  3. Could you provide any code/ screen shots of blueprints that may be involved with this issue?
6

Hello twicfall,

We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will offer further assistance.

Thank you.