Search Issue Tracker

Fixed in 2017.2.0f3

Fixed in 2017.2, 2017.3



Found in


Issue ID




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

Scene Management


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 (7)

  1. 1f59e419b9b61098a616848b17273c25?d=mm


    Aug 27, 2019 13:01

    This is very interesting, You’re a very skilled blogger. I have joined your feed and look forward to seeking more of your magnificent post. Also, I’ve shared your website in my social networks!

  2. 8b94b9228dc7bf8ee4bac59a23d6cccc?d=mm


    Aug 07, 2019 08:12

    Certain 2 areas in this article are truly the very best we have had.

  3. 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.

  4. A1d4cee82297c3d3c32d4099d6d9f895?d=mm


    Nov 21, 2017 11:22

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

  5. C01ddebc45b8feddb73124bc9ced816a?d=mm


    Nov 08, 2017 18:48

    Same here, please fix!

  6. 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.

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.