WP-Admin and Editing post Loads too slow

I have my page 91/100 in google page speed insight, pages are loads les then 2 Sec and whenever I press to edit an post or to enter in the Dashboard it takes abaut 20-40 sec to load… sometimes can be more then 1 minute. I cannot disable some plugin because I need them all. Can I just make the wp-admin pages to load with the same way as the normal pages?
I have found some old solutions but there are was 4 yers before and all now are not exist.
*The Developer Tools by google the addon on chrome tells me that I have to match “js” that are needed to define.