admin-ajax.php slow loading

Hello,
I get a error 400 from google webmaster tools for the page: wp-admin/admin-ajax.php
After a scan with gtmetrix i can see that the problem is:
/wp-admin/admin-ajax.php?action=tx_compare_get_fragments
action
tx_compare_get_fragments
Response
{“success”:true,”data”:{“defaultFragments”:{“.menu-compare > a”:”0″},”customFragments”:[]}}
is this related with your plugin?
(php version 7.2.7)

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