Low fps on Linux when tooltip window appears

Hovering the mouse over an asset/menu option that produces a tooltip window, the fps will drop while the tooltip is visible.

Reported using Mint Cinnamon 17.3
Internal machine uses Ubuntu 15.10 and has not reproduced this issue.

1. Open the editor (compiled from the Release branch)
2. With the editor visible, mouse over an asset in the content browser that would produce a tooltip.
3. The rendered tooltip will show up, but move very sluggishly when the cursor moves. The FPS in the viewport will slow down as well.

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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