Preferences windows cause memory leak and slowdowns in Editor
Either the Editor or the Project preferences (or both) are left open (in foreground, bg, or only a tab in the header), the PIE related operations (stop/eject/possess) will cause the editor to raise the memory usage about ~200mb per Preferences Window sessions. The memory usage would raise on each PIE ops until the point the system runs out of memory and Editor/System can crash. When you close the preferences windows the memory gets released. I also experience slowdowns in the preferences window open and close ops, and the PIE operations are also lagging considerably which takes a couple of seconds to execute, while the preferences windows are open.
The 4.14.0-preview 1 was the first build that produce this error, 4.13.2 and before were not affected by this problem.
Tested with 4.14.0 prev1, prev2, both the launcher and source 4.14.0 release versions, and the most recent 4.14 branch (source). All are affected by the issue.
Why a window left in the background can cause issues at all? I usually leave them for quick access, but i don't expect them to be active until i bring them to the front.
asked Nov 24 '16 at 07:35 PM in Bug Reports
This has been entered as UE-39211, as noted in the other active thread about this.
answered Nov 30 '16 at 08:51 PM
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