I don't know if there's a hard and fast rule. The major tradeoffs are size
and speed. The TridiaVNC distro is about 7-11 MB, whereas the binaries
from AT&T are about 1 MB. So, obviously the AT&T binaries are faster to
download and install on a slow link, but will not offer the same native
compression over that same slow link.
That said, if you have a compressed tunnel (e.g. SSH) for your connection,
you may still see improvements with tight encoding, but it won't be as
critical as if you were doing uncompressed traffic.
My $0.02: if you're connecting over 56K or less, use tight encoding if you
can. At 128K (ADSL or ISDN), tight encoding or heavy zlib compression can
still help, but you start trading off with latency. At higher speeds, you
probably will want to minimize zlib compression and use hextile, since
latency will become more obvious.
Your mileage may vary.
--
Todd A. Jacobs
Senior Network Consultant
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