Unity version: 2018.2.16f1 (Also reproduced on 2018.1.9f2 and 2018.3.0b10 BETA) Platform: Windows 10 64bit Specs: Intel i7-5820k 6-core 3.3ghz, 16GB RAM, Geforce 1080 (Latest drivers 416.94) Editor is running in DX11 Project: Fresh 3D Template project. 0 changes. My repro: As simple as using WASD to move around in the scene view drops frames by a ton. So badly that I can actually release the keys and the scene will still be trying to move the camera as if the keys are still pressed down. Eventually it catches up. So I profiled the editor and tracked it down to Unsupported.IsDeveloperMode in deep profiling mode. See attached pics. Note, there are more calls to that than just what is highlighted. Follow the profile to data to see each one. What is this? I assume plenty of others aren't having this as an issue or else it would have already been reported/fixed. Any ideas of what I can do to fix this? P.S. I was UNABLE to reproduce this on 2017.4.15f1 LTS, 2017.2.4f1, 2017.1.5f1, or 5.6.6f2.