https://bugs.documentfoundation.org/show_bug.cgi?id=104716
--- Comment #46 from Roland Baudin <[email protected]> ---
Here are more tests on Linux, using recent versions of LibreOffice:
1. Test conditions
==================
- Hardware is HP workstation z820, with two Intel Xeon E5-2687W 0 @ 3.10GHz (16
cores, 32 threads), Nvidia Quadro K2000, 128 GB RAM
- CPU frequency set to its maximum (performance mode)
- Ubuntu Linux 16.04.3 LTS (Xenial Xerus) 64-bit
- LibreOffice versions 5.4.4.2 and 6.0.1.1 (both 64 bits)
- GTK2 (no OpenGL) and GTK3 rendering
- Nvidia driver 340
- document 'test_complex_document.odt' (attachment 136239)
- zoom 140% on a 24" monitor (default when opening the document)
- fresh LibreOffice profile for each test
2. Results
==========
a. Scrolling the entire document with the page down key
--------------------------------------------------------
5.4.4.2 GTK2 => 10"
5.4.4.2 GTK3 => 12"
6.0.1.1 GTK2 => 10"
6.0.1.1 GTK3 => 12"
b. Scrolling some pages with the mouse wheel
--------------------------------------------
5.4.4.2 GTK2 => fast
5.4.4.2 GTK3 => fast
6.0.1.1 GTK2 => fast
6.0.1.1 GTK3 => slow (much slower than with GTK2)
c. Scrolling the entire document with the mouse
-----------------------------------------------
5.4.4.2 GTK2 => fast
5.4.4.2 GTK3 => a bit slower than with GTK2
6.0.1.1 GTK2 => fast
6.0.1.1 GTK3 => a bit slower than with GTK2
d. Smooth scrolling activated
-----------------------------
5.4.4.2 GTK2 => fast
5.4.4.2 GTK3 => very slow, completely unusable
6.0.1.1 GTK2 => fast
6.0.1.1 GTK3 => very slow, completely unusable
3. Summary
----------
Versions 5.4.4.2 and 6.0.1.1 are fast with GTK2 rendering, whatever the
scrolling method.
There are several issues with GTK3: keyboard scrolling is slower (both
versions), mouse wheel scrolling is much slower (6.0.0.1) and mouse scrolling
is slower (both versions). Also, smooth scrolling is completely unusable with
GTK3.
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