Bug Incredibly slow refresh, editor completely freezes

I've been having a problem lately where the editor takes ages to refresh and sometimes completely freezes. I can't alt+tab to it, and clicking on it from another window does nothing (windows doesn't show unity as focused). I checked my logs, and it takes anywhere from 1 minute to 5 minutes to refresh:

Code (csharp):

1. Refresh completed in 319.796790 seconds.
2. RefreshInfo: RefreshV2(ForceSynchronousImport)
3. RefreshProfiler: Total: 0.000ms
4.    InvokeBeforeRefreshCallbacks: 319794.774ms
5.    ApplyChangesToAssetFolders: 1.413ms
6.    WriteModifiedImportersToTextMetaFiles: 0.084ms
7.    CleanLegacyArtifacts: 0.000ms
8.    Scan: 0.000ms
9.    OnSourceAssetsModified: 214.563ms
10.    UnregisterDeletedAssets: 3.148ms
11.    InitializeImportedAssetsSnapshot: 0.000ms
12.    GetAllGuidsForCategorization: 16.281ms
13.    CategorizeAssets: 0.811ms
14.    ImportAndPostprocessOutOfDateAssets: 83.216ms (319398.929ms without children)
15.        ImportManagerImport: 224360.092ms (2272.351ms without children)
16.            ImportInProcess: 35.052ms
17.            ImportOutOfProcess: 2237.229ms
18.            UpdateCategorizedAssets: 0.000ms
19.            RemoteAssetCacheGetArtifact: 0.070ms (0.000ms without children)
20.                RemoteAssetCacheResolve: 0.000ms
21.                RemoteAssetCacheDownloadFile: 0.000ms
22.        CompileScripts: 0.000ms
23.        PostProcessAllAssets: 92626.646ms
24.        ReloadImportedAssets: 81.572ms
25.        VerifyAssetsAreUpToDateAndCorrect: 30.416ms
26.        EnsureUptoDateAssetsAreRegisteredWithGuidPM: 0.000ms
27.        InitializingProgressBar: 1.707ms
28.        PostProcessAllAssetNotificationsAddChangedAssets: 0.003ms
29.        OnDemandSchedulerStart: 0.938ms
30.        RestoreLoadedAssetsState: 0.913ms
31.    InvokeProjectHasChanged: 8.076ms
32.    UpdateImportedAssetsSnapshot: 0.000ms
33.    ReloadSourceAssets: 16.216ms
34.    UnloadImportedAssets: 6.687ms
35.    Hotreload: 0.950ms
36.    FixTempGuids: 8.044ms
37.    VerifyGuidPMRegistrations: 0.015ms
38.    GatherAllCurrentPrimaryArtifactRevisions: 0.000ms
39.    UnloadStreamsBegin: 0.953ms
40.    LoadedImportedAssetsSnapshotReleaseGCHandles: 0.042ms
41.    GetLoadedSourceAssetsSnapshot: 1.231ms
42.    PersistCurrentRevisions: 14.451ms
43.    UnloadStreamsEnd: 0.000ms
44.    GenerateScriptTypeHashes: 0.021ms
45.  

The only code that should run before/after importing assets is Mirror and NugetForUnity. I've used Mirror in other projects and had no problems with it, and NugetForUnity only runs when I do it manually. The project is only 700mb total, with most of it being in the /Library folder. I have a max of 80 scripts, half of which are in a DLL.

I've also noticed that loading the project takes 90 seconds, when the numbers don't add up:

Code (csharp):

1.  
2. [Project] Loading completed in 93.495 seconds
3.     Project init time:                 1.814 seconds
4.         Template init time:         0.000 seconds
5.         Services packages init time:     0.000 seconds
6.         Package Manager init time:         0.000 seconds
7.         Asset Database init time:         0.000 seconds
8.         Global illumination init time:     0.000 seconds
9.         Assemblies load time:             0.000 seconds
10.         Unity extensions init time:     0.031 seconds
11.         Asset Database refresh time:     0.000 seconds
12.     Scene opening time:             3.031 seconds
13.  

Does anyone have a fix for this issue? I can barely get any work done due to this.

 

I don't know but I am here because I too am having refresh problems on the new update. Same project, 10x the wait time. On a 64 Core 128GB ram M.2 Based System.
Project is 200mb and 20 scripts. Something changed unity. Please fix it.

 

I am having the same editor problem!

I have noticed that a small minority of Unity developers have this same problem. I do not think that this has anything to do with Unity editor. Maybe a missing update, maybe a missing Visual Studio component, a faulty driver installation or maybe simply a specific build of Windows causes this issue?

Win10 build 19041
3.00 ghz 8 core CPU,
64 gb ram,
gtx 1080ti,
m.2 ssd

 

I had a similar issue. Turns out there was an issue with AMD Ryzen CPUs.

https://www.extremetech.com/computing/246304-amd-fix-coming-fused-multiply-add-fma3-ryzen-bug

If you have a Ryzen cpu try updating your bios.

 

I am seeing this as well using 2019.4.8f1 and vs 2019 community. I have a copy of the project from 2019.3 it does not have the issue, vs runs fine with that solution file. VS is also reporting very high power usage, not sure if that is normal.

Update, upgraded to 2019.4.9f1. copy of main project seemed to load quickly in vs, and typing seemed normal. upgraded main project, still very laggy and is not responding frequently.

 

I'm running on an intel CPU...

 

My issue was resolved, ended up being some sort of cache within VS. I literally renamed the unity project's folder and it fires right up as VS sees this as a different solution. If you make a copy of your project and fire it up and drop into VS and it seems to work smoothly, this could be your issue as well. I suffered through months of the slowest IDE I've ever used and a folder rename resolved it, ridiculous!