Slow VST scanning, project loading with LinVST

[Celphor]

Hi,

I am new to Reaper on Linux. I used Reaper for a long time on Windows.
I have Linux experience for almost 20 years and I would really love to do the transition with my music production stuff (amateur level).

I compiled LinVST and got it working well. Low latency with ALSA, everything running sweet so far when processing.

The only thing I can complain about are slow loading/scanning times for the VSTs. It takes 1-2 seconds for one VST instance to process. Scanning all plugins is painfully slow. This wouldn't be a problem, as you rarely do it, but it also happens when loading a project.
In the shell window I see the VSTs being loaded, but some are really slow (e.g. FM8 or Battery 4). It takes 1-2 seconds for each INSTANCE to process.

I see repeating output like

Loading /home/username/.wine/drive_c/VST64/FM8.dll
DSSI VST plugin server v0.986
Copyright (c) 2012-2013 Filipe Coelho
Copyright (c) 2010-2011 Kristian Amlie
Copyright (c) 2004-2006 Chris Cannam
LinVst version 2.8.0

From my windows time I remember huge projects loading in a reasonable time. But now even a fairly small project takes 20 seconds to load.

It's obvious that Wine and the LinVST wrapper will introduce overhead, but that much?

I'm on a i7 4 core with 16GB RAM/SSD on Gentoo Linux x64 up to date.
The machine is performing very well for all other tasks.
ALSA latency is ~5ms without any tweaks

I use

Reaper 6.0.1 Linux native
Wine staging 4.21
Gnome 3.32
Kernel 5.4.1

and set

@users hard memlock 1000000
@users soft memlock 1000000
@users hard rtprio 99
@users soft rtprio 99

in /etc/security/limits.conf to satisfy LinVST

Wineserver is already preloaded.

What is your experience? Any ideas to speed it up?

Greets

Celphor