While importing a json file with a large amount of sprites, memory usage spikes. The test asset uses a 2000x128 texture with 1024 elements.

Steps to Reproduce

1. Launch: UE4Editor.exe
2. Open the user's Spartan_Saga_New project
3. Import the user's demo spritesheet.json

The import process will take over 8 minutes, during which time the engine will increase its memory usage to roughly 28G.

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ComponentUE - Gameplay - Paper2D
Affects Versions4.54.6
Target Fix4.7
Fix Commit2365310
CreatedOct 24, 2014
ResolvedNov 19, 2014
UpdatedApr 27, 2018
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