I got delays too if i open the Woocommerce in admin. The frontpage works fast and great, and the other Dashboard of Wpress too. This in a VPS 2 core and 4GB and 256MB for WordPress set with php 7.2 and Apache I checked it with query monitor and in ssh and it sends really a lot requests and seconds after again...i see the same requests (POST) ...and then again...This dont happens always. I used the disable admin plugin and now all is great. I dont know why this happens and why dont always. Maybe a bug or some bad code or a compatibility issue. I am Dev and sysadmin but no time to search more. Time is money ¨:) The plugin solution was great for me....