The times for security checks may vary even within the same day. It is therefore recommended that you always arrive at the airport well in advance.
Place valuables and cash in the tray in such a way that they are not immediately visible to those preceding or following you in line (e.g. by slipping them into a jacket pocket, etc.).
Try as much as possible to maintain eye contact with the tray.
Remember that security staff do not take over the items you have placed in the tray, and cannot identify which passenger has used which tray.
Security checks are designed to prevent dangerous or prohibited items from being loaded onto the aircraft.