Why is Windows Defender delaying the start of our piece of software?

问题

I'm trying to help the SuperCollider community to try and understand how we can prevent Windows Defender from delaying the execution of one of the executable, on a up-to-date Windows 10.

The original github issue can be found on github.

Here is the test case :

1. download the latest version of SuperCollider for Windows x64 (3.10.3)

2. install it

3. reboot your computer

4. open "cmd" and start scsynth.exe

cd "\Program Files\SuperCollider-3.10.3"
scsynth.exe -u 57110

You will have to wait 50 to 60 seconds for seeing scsynth output which should start with something like

Device options:
  - MME : Mappeur de sons Microsoft - Input   (device #0 with 2 ins 0 outs)
[...]
SuperCollider 3 server ready.

5. Note that if you quit scsynth.exe and run the command again, scsynth.exe starts right away without delay

6. Now put scsynth.exe process in Windows Defender exclusion list (see this article for info of how to access this exclusion list)

7. Reboot

8. Open "cmd" and start scsynth.exe

cd "\Program Files\SuperCollider-3.10.3"
scsynth.exe -u 57110

Now scsynth.exe starts right away.

This behaviour started when Windows Defender block at first sight feature was added.

It raises a lot of problems for SuperCollider Windows users.

Can anybody help us to circumvet the problem ?

来源：https://stackoverflow.com/questions/58383531/why-is-windows-defender-delaying-the-start-of-our-piece-of-software