Edit MattK: I think the simplest and safest solution to this is to simply prevent all input from leaving a running play in editor viewport.

A user wants to bind CTRL key to crouch, and when they use the CTRL+S combination to crouch move backwards, it conflicts with the editor's "save all levels" binding and creates lag and causes a crash.

This only occurs so far in "Play in New Window". It's not necessary to bind input commands to repro the issue, but this is a legitimate user case.

Steps to Reproduce

1. Run ue4editor.exe
2. Choose Play in New Window
3. enter the stat unitgraph command
4. Press CTR+S while in the game

RESULT: There are FPS spikes

WORKAROUND: This doesn't occur if you unbind CTRL+S from the "save all levels" command. Also it doesn't occur in Play in Viewport

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Cannot Reproduce
Affects Versions4.74.8
CreatedApr 9, 2015
ResolvedMay 3, 2019
UpdatedMar 27, 2020