User-Agent:       Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/65.0.3325.181 Safari/537.36
Build Identifier: 

If LibreOffice is not yet running, it takes too long to open even the simplest
of documents. Opening a document with just one line of text takes 20 seconds.
On my Debian system with LibreOffice 5, the same document loads in a few
seconds. This also happens if you first open LibreOffice Writer and then open a
document via File->Open.

If LibreOffice is already running with another opened document, then opening
the same test document goes as expected within a few seconds.

When started from the terminal, I do not see any errors or information. While
waiting for the document to open, I do not see anything weird on the CPU load.
Actually, CPU load stays very low. It seems to wait for something and then
continue after something times out.

Some version information:

openSUSE Tumbleweed: version 20180410
LibreOffice: Version 6.0.3.2
             CPU threads: 4
             OS: Linux 4.16
             UI render: default
             VCL: gtk3 
             Locale: en-US (en_US.UTF-8)
             Calc: group
Java: OpenJDK Runtime Environment (IcedTea 3.7.0)
      build 1.8.0_161-b12 suse-2.1-x86_64

I run openSUSE in VMware Workstation Player 14. I tried on it two different
PC's with the same result.

I'll happily provide more information. Just instruct me with where to look and
what to do to collect whatever info you need.

Reproducible: Always

Steps to Reproduce:
1. Make sure LibreOffice is closed.
2. Open an ODT-file by double-clicking it.

Actual Results:  
Takes > 20 seconds to open the document.

Expected Results:  
That the document opens faster, so within about 5 seconds.

I have the following LibreOffice related applications an packages installed:

LibreOffice Base
LibreOffice Calc
LibreOffice Draw
LibreOffice Impress
LibreOffice Writer
libreoffice
libreoffice-base
libreoffice-branding-upstream
libreoffice-calc
libreoffice-draw
libreoffice-filters-optional
libreoffice-gnome
libreoffice-gtk3
libreoffice-icon-themes
libreoffice-impress
libreoffice-l10n-de
libreoffice-l10n-en
libreoffice-l10n-nl
libreoffice-mailmerge
libreoffice-math
libreoffice-pyuno
libreoffice-share-linker
libreoffice-writer

Output of screenfetch:

 OS: openSUSE 
 Kernel: x86_64 Linux 4.16.0-1-default
 Uptime: 14m
 Packages: 2255
 Shell: bash 4.4.19
 Resolution: 1920x1080
 DE: Cinnamon 3.6.7
 WM: Muffin
 WM Theme: Linux Mint (Arc-Darker)
 GTK Theme: Arc-Darker [GTK2/3]
 Icon Theme: Numix-Circle
 Font: Noto Sans 9
 CPU: Intel Core i5-4670K @ 4x 3.4GHz
 GPU: SVGA3D; build
 RAM: 1444MiB / 7947MiB