To reproduce:
1. Open attached project;
2. Open scene Main;
3. Make sure Profiler window is open;
4. Enter Play mode;
5. Check Profiler;
6. Exit the Play mode, find gameobject named "Parent" in Hierarchy and change its position to (0, 0, 0);
7. Enter Play mode and check Profiler

Actual result: Canvas.SendWillRenderCanvases goes to 70ms.
Expected result: There should be no latency.

Reproduced in: 5.5.2p1; 5.5.2p2; 5.6.0b11; 2017.1.0a2

WorkAround: When you disable Pixel Perfect problem is gone as well.