This is the template for a good quality LAN connection using TigerVNC

Just replace the IP address / hostname

ServerName=192.168.1.123:1
X509CA=
X509CRL=
SecurityTypes=None,VncAuth,Plain,TLSNone,TLSVnc,TLSPlain,X509None,X509Vnc,X509Plain
DotWhenNoCursor=1
AutoSelect=1
FullColor=1
LowColorLevel=2
PreferredEncoding=Tight
CustomCompressLevel=0
CompressLevel=2
NoJPEG=0
QualityLevel=8
FullScreen=0
FullScreenAllMonitors=1
DesktopSize=
geometry=
RemoteResize=1
ViewOnly=0
Shared=0
AcceptClipboard=1
SendClipboard=1
MenuKey=F8
FullscreenSystemKeys=1
AlertOnFatalError=1

Save that as filename.tigervnc and set filetype to open with the tigervnc viewer