Search Issue Tracker

Won't Fix



Found in




Issue ID




Unity Editor frame rate drops when making many successive inputs



Reproduction steps:
1. Create a new 3D Unity project
2. Open the Profiler (Window -> Analysis -> Profiler)
3. Change the Profiler window to record Editor performance
4. Start pressing the keyboard buttons rapidly

Expected result: Consistent and stable performance
Actual result: Performance degradation

Reproducible with: 2021.2.0a16, 2021.2.18f1, 2022.1.0b13, 2022.2.0a9
Not reproducible with: 2019.4.37f1, 2020.3.32f1, 2021.2.0a15

- To document the degradation of performance the FPS metric in the Profiler was used
- 2019.4 and 2020.3 at the lowest went to 100FPS whereas later streams went as low as 60FPS and rarely to 30FPS
- Reproduction is somewhat inconsistent, to reproduce do step 4. then promptly stop and start step 4. again, doing this in intervals helps with reproduction

  1. Resolution Note:

    The customer who reported this issue says it no longer represents a problem starting from 2020.3.32f1 and onward. Other reported cases differ sufficiently to be considered as a separate bug, with different reproduction steps.

Comments (1)

  1. Pheck

    Mar 21, 2022 17:52

    We see this issue in our production project and in clean projects. It generates about a 130ms spike for us when we press a key in our production project and a 3ms spike in a clean project. The same input event from a gamepad does NOT cause this issue in either project.
    "Max Frame Rate" in nvidia has nothing to do with the repro for us.

    This issue is currently a major problem for us in the editor as we cant test with keyboard without major perf spikes.
    We are using 2020.3.26f1 win10

Add comment

Log in to post comment

All about bugs

View bugs we have successfully reproduced, and vote for the bugs you want to see fixed most urgently.