Total layout time ({0:#0.00 seconds}) is high. Element {1} took the most time in layout and is contributing to the low frame ...

Total layout time ({0:#0.00 seconds}) is high. Element {1} took the most time in layout and is contributing to the low frame rate. This could be because CPU-bound animations are causing layout updates.

Go to the Performance Warnings menu in the navigation toolbar and select the Frames view. Sort the frames by clicking the CPU Time column header and select the frames with the highest CPU time. From the Frames view, select the Visual Tree option and identify visual {1} in the tree.