Search Issue Tracker

Fixed in Unity 2017.2.0f3



Found in


Issue ID




Asset refresh times are approximately 5 times longer in Unity 2017.2.0a2 and later versions

Scene Management



Priority: 2Necessary for shipping a final release


Severity: 2Core functionality majorly impacted

How to reproduce:
1. Open the attached "SurvivalShooter" project
2. Perform a few Asset refreshes by pressing Ctrl + R (or CMD+R, if you are a Mac user) on the keyboard a few times
3. Observe Editor.Log and its Asset refresh times

Expected result: In 2017.2.0a2 and later, Asset refresh time should be around ~0.01 seconds, like in the 2017.2.0a1 and prior versions
Actual result: Asset refresh time is consistently around ~0.04 seconds in the 2017.2.0a2 and later versions

Regression introduced in - 2017.2.0a2
Reproducible with - 2017.3.0b3, 2017.2.0f2, 2017.2.0a2
Not reproducible with - 2017.2.0a1, 2017.1.1p4

Asset refresh time comparison between 2017.2.0a1 and 2017.2.0a2 versions in Survival Shooter project on Samsung SSD 850 EVO 250 GB, Windows 10 :
2017.2.0a1 -
Refresh: elapses 0.009462 seconds
Refresh: elapses 0.007476 seconds
Refresh: elapses 0.007297 seconds
Refresh: elapses 0.007508 seconds

2017.2.0a2 -
Refresh: elapses 0.040612 seconds
Refresh: elapses 0.060603 seconds
Refresh: elapses 0.039310 seconds
Refresh: elapses 0.039079 seconds

Comments (5)

  1. 51abea48ae5691151b6573d7b0639e40?d=mm


    May 20, 2019 07:17

    Fixes to 2017.2.0
    • Editor
    Fixed race conditional that should cause Editor to freeze on entering play mode.
    Resolved an issue that reverting changes to a prefab would corrupt the prefab.
    • Graphics
    Fixed crash that opening occlusion tab in a scene containing Speed trees.
    • iOS
    Fixed iOS11 crash that launching app in landscape mode.
    Fixed startup crash in iOS 7.x.
    • Package Manager
    VCS plugins presently track the Package Manager manifest.
    • Particles
    Fixed issue that by emission bursts may not <a href=" ">upgrade</a> correctly during upgrading a project from an earlier version of Unity.

  2. A1d4cee82297c3d3c32d4099d6d9f895?d=mm


    Nov 21, 2017 11:22

    It's not fixed, it's still too slow in latest patch release

  3. C01ddebc45b8feddb73124bc9ced816a?d=mm


    Nov 08, 2017 18:48

    Same here, please fix!

  4. 75d6afe632f4de8327f85a7cdf6c5388?d=mm


    Oct 19, 2017 12:29

    For us ( ) it is even worse. Before it took ~1s now it takes ~17s. We have a lot of assets admittedly (~300k). This issue prevents us from upgrading atm.

All about bugs

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