PIMCORE-6 is very slow on my office-server VPS

Hello,

I have installed Pimcore-6 (bitnami installer) on my bussiness server (VPS)
running on Centos 7
but i so not understand but it is EXTREME slow
it takes +/- 20min to unfold a folder, and +/- 5 minutes to open a file.
i tested before, but it was never that slow as now

file system is XFS
free memory about 16gb
php.ini: memory_limit = -1

/opt/pimcore-6-dev/apps
rwxr-xr-x 5 root root 54 Jan 1 02:48 .
drwxr-xr-x 16 root root 4096 Apr 8 00:48 …
drwxr-xr-x 3 root root 20 Jan 1 02:45 bitnami
drwxr-xr-x 5 root root 48 Jan 1 02:48 phpmyadmin
drwxrwxrwx 5 root daemon 79 Jan 1 02:50 pimcore

CHMOD 777 -R pimcore
CHOWN root: daemon -R pimcore

Hello, can anyone help me with this problem