PPP slows down the system

[Hexren]

> Hi everybody. 
> I'm using a 56k connection to access the Internet. I'm using user PPP,
> and everytime I dial up, everything works too slow. At least X works
> quite bad (and so KDE). When I try "startx", it freezes for a few
> seconds and then it starts and takes a long time to load KDE. Also,
> the applications in KDE start very slowly (when they start).
> Everythings works allright when i get disconnected....
> Can anyone give me an idea of what is happening (It isn't the first
> time it happens, I've tried in another computer with FreeBSD and it
> happens the same)?

> I'm using FreeBSD 5.3 amd64.

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How many Interfaces are you using ? And are you logged in over the
network ?