Reloading Assemblies is extremely slow. How to fix that?

Question

I once for all decided to do something about my slow compile time (around 14 seconds).

So, after lots of research, I found a way to benchmark the issue: https://gist.githubusercontent.com/filod/ba1e1522c1821cd24ca1a0c9090eb440/raw/32130f055da95f6ee4cf647aae4a35ea180eeea7/AsmdefDebug.cs

After that, I moved my imported asset folders into the "Standard Assets", which helped slightly decreasing the compile time but the compilation still takes around 8s. I tried removing all the unneeded "[InitializeOnLoad]" and removed some built-in packages from the Package Manager, still the same.

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How do I decrease the Assembly Reload Time?

It takes 7.6s seconds to reload the assemblies after having added/removed a character in a script. That shouldn't happen in my opinion... What else can I do?

Answer 1

Answer by crare · Oct 10, 2021 at 07:55 PM

Restarting Unity once in a while seems to help. Unity seems to bog down when it's open for multiple days. This maybe a issue with compiling files or something else buggy in your own code or the Engine. It may also be issue with memory use. Restarting your PC once a day anyway should help in most cases.

Good rule of thumb with any software related: Have you tried turning it off and on again?

If these won't work, only then I would suggest re-importing all your assets, it might break something so I wouldn't do that as a first option.

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Answer 2

Answer by Waffle1434 · Jan 13 at 05:50 PM

Restarting Unity Editor fixed this for me. Very silly. I went from a 40 seconds compile/reload script assembly time, to <2s.

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Itharen · Jan 27 at 02:37 AM 0

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exact same here

Answer 3

Answer by Borjka · Jul 07, 2021 at 11:47 AM

Got same in 2021.1.1f1 it takes ages to do any changes in scripts or start game, while in UE or CORE it takes less than 1 second, looking forward to switching to UE

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Answer 4

Answer by macagu · Jul 13, 2019 at 08:05 PM

Try REIMPORT ALL, and then restart Unity. I was experimenting an Assembly Reload Time of 8 seconds, and now it went down to 2 seconds. I guess sometimes, somehow, something gets wrongly catched. I'm using Unity 2019.1.8f1

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neshius108 · Jul 14, 2019 at 03:42 AM 2

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I did some research and ended up writing a post about it with my findings: https://gamejolt.com/games/talesofkulplex/313193/devlog/tales-of-kulplex-devlog-6-attempting-to-decrease-compile-times-she9y7qf

But basically, you gotta split the project into assemblies and try to reduce the number of files in the project.

wheee09 · Dec 05, 2019 at 09:56 AM 0

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I second the restarting of Unity. I tend to keep it open for many hours to many days at a time.

I didn't have to reimport all - but after restarting I went from 4.8s to 1.6s. I'm on a beast of machine with 64 gb of ram and 8 cores and none of it was being stressed in the slightest. So there's something else that's causing Unity to get slower and slower over time.,I noticed that if I keep Unity open for awhile (ie. many hours to days) it will get slower and slower. I restarted Unity and my Assembly Reload Time went from 4.5s down to 1.6s.

I'm not sure why tho... it's not memory tho - I'm on a beast of a machine with 64gb of ram and it wasn't even using half of that and 8 cores.

Breaking up your assemblies should also work but it can be a lot of work as you may need to refactor a crap load of stuff so that the dependencies make sense.

Answer 5

Answer by DryreL · Jun 12, 2021 at 07:16 PM

I have same problem (Unity 2021.1.7f1)

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Reloading Assemblies is extremely slow. How to fix that?

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