admin-ajax.php takes long

Dear Minimus,
by running GTMETRIX I see that admin-ajax.php is running long. Is there anything we can do about shortening the time?

This is response:
{“success”:true,”data”:[{“ad”:”<div id=’c8434_59_6′ class=’sam-pro-container sam-pro-place’ style=’display: flex; flex-direction: row; justify-content: center; flex-direction: row;’><\/a><\/div>”,”aid”:59,”pid”:6,”cid”:”c8434_59_6″,”eid”:”c7484_0_6″}]}

The page I need help with: [log in to see the link]