Networking :: Help with slow VNC

It was fast, but now slow. It is drawing line by line remote desk. At first time it was fast as a shark!
It does not start from bootlocal.sh or xinit.rc:
/usr/local/bin/vnc4x.sh &
/usr/local/bin/vnc4x0.sh & (error because of console mode)

In /usr/local/bin/vnc4x.sh:
/usr/local/bin/vncserver -SecurityTypes=VncAuth

In /usr/local/bin/vnc4x.sh:
/usr/local/bin/x0vncserver -SecurityTypes=VncAuth -PasswordFile=/home/dls/.vnc/passwd

All via internet, real IP's. 512/512 both lines.
What to check or do better?
I start now VNC logging with ssh & command /usr/local/bin/vnc4x.sh.
other term: vncviewer x.x.x.x:1

I have to take back my problem. Because all was for a broken NIC!

P.S edit: First I used TightVNCviewer from Ubuntu Linux. It also makes all much more slower! (Or perhaps some config problem with it...).

original here.