Eeschema slow graphics

[tom_iphi]

Hi,

I am running KiCAD5.1.6 on a Levovo T440s, Intel I5-4300U, Intel HD Graphics with up-to-date drivers, OS is Win10.

In eeschema I experience that the cursor follows the mouse pointer with estimated 0.5s delay which is very irritating.
Task manager shows 20% CPU usage and 10% GPU usage while I drag around a symbol in circles.
Can anything be done about this?

On the same machine I still have an old Kicad version (3?) from 2009 installed. There, the problem does not occur, graphics are very smooth and fast.

Best regards,
Tom

P.S. Here is my version info:
Application: KiCad
Version: (5.1.6)-1, release build
Libraries:
wxWidgets 3.0.4
libcurl/7.66.0 OpenSSL/1.1.1d (Schannel) zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.1.1) nghttp2/1.39.2
Platform: Windows 8 (build 9200), 64-bit edition, 64 bit, Little endian, wxMSW
Build Info:
wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8)
Boost: 1.71.0
OpenCASCADE Community Edition: 6.9.1
Curl: 7.66.0
Compiler: GCC 9.2.0 with C++ ABI 1013

Build settings:
USE_WX_GRAPHICS_CONTEXT=OFF
USE_WX_OVERLAY=OFF
KICAD_SCRIPTING=ON
KICAD_SCRIPTING_MODULES=ON
KICAD_SCRIPTING_PYTHON3=OFF
KICAD_SCRIPTING_WXPYTHON=ON
KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
KICAD_SCRIPTING_ACTION_MENU=ON
BUILD_GITHUB_PLUGIN=ON
KICAD_USE_OCE=ON
KICAD_USE_OCC=OFF
KICAD_SPICE=ON

[eelik]

Have you tried Preferences -> Accelerated and Fallback toolsets?

[tom_iphi]

I have set both to “No Antialiasing” which I recon is the fastest setting.

One more find:
I have released the KiCAD folder on my HDD and mounted the folder as a separate drive with its own drive letter.
This is how I normally work with KiCAD.

The problem only occurs on big projects with many hierachical sheets on that mounted drive.
If I directly access the project on the HDD (not via the separate drive letter), the problem does not occur at all.
How on earth can disk access influence cursor speed?

BR Tom