Grav Admin Panel is slow on Hostinger

I have the problem that the admin panel of my website loads very slow when I access pages or save them (~10 seconds). The website itself is fast.

When I am on localhost, the admin panel pages section is fast and also when saving I have to wait less than a second. My production server is hosted by Hostinger/ business web hosting. The resources are not fully used, so I’m confused why it takes so long to edit the pages.

Does anyone have an idea why it could take this much time?