When i use thie search on even simple scene, Unity goes absolutely crazy. All resources on PC fully consumed requiring an emergency hot reboot. Very unprofessional to have such broken functionality that it breaks the users PC. A seriously bad by design implementation.

So, if I'm reading this page right, is Unity saying that since it's "Not Reproducible" in Unity 2017 they're not going to fix it in 5.6.1f1?

I, too, am seeing this - and it's pretty bad as it will chew through 20GB of RAM in a matter of less than a minute. I'm also seeing a memory leak if I search my Assets folder - but it's not as bad. I keep having to restart Unity, though, and it's a massive PITA.

Having same issue, still present. 5.6.1f1

Issue is still present for us. in 5.6.1p1.

The same with Unity 5.6.1. I can't work.

I have the same in my project since last update

I also get a memory leak.

Unity 5.6.1f1

I have this in Unity 5.6.1. and p1. https://youtu.be/dGYqq01MptQ?t=25s

We are just trying to switch to 5.6.0p4 and since our project is somewhat bigger it is now impossible to use the hierarchy search. Which makes it impossible to work with this version. A fix would be nice.