Click on Start orb, type eventvwr in the search or run box. In the eventviewer window, click on Applications and services logs-> Microsoft-> windows-> Diagnostics-performance-> Operational. Then in the right pane, click once or twice on Event Id to sort by ascending or descending order, then locate id 500.
You are already there in the snip you posted, just sort events by clicking on event id.
Also, open task manager and check ram usage at the time the slowdown happens. Again sort processes in descending order of ram usage and note down the top 5.