Why does Netplay always go out sync even over LAN?

[lwc]

I know it was mentioned in various threads, yet I found no dedicated topic for it, so here's one.

Using the latest version (currently 1.60) I've tried playing with all the settings under "Netplay" and yet it always go out of sync sooner or later (usually sooner).
Why isn't even LAN fast enough to make sure it stays synced?

If only the Re-sync option was automatic...