-----Original Message-----
I believe there is one minor correction: By my
understanding, sliced images will speed up download times
to an extent.
Four packets can cross the wire at a time, so with the
following example:
connection speed: 100K/second
If you have an image that is 100k, that passes over the
wire all by itself in 1 second.
BUT
if you have four images that are 25k each (like slicing
the 100k image up into four parts) the image will
download in .25 seconds because all four images can cross
the wire at the same time.
Suppose you have a 50kbps modem connection. Accounting for
overhead, it will transmit about 5 kilobytes per second,
so a 100KB picture will take 20 seconds to download.
Now, split the picture into four. With all four
connections open, each one will get about 25% of the
bandwidth - 1.25 kilobytes per second. So each of the four
segments will take 25/1.25 = 20 second to download.
However, it does take time to open and close the four
connections. So downloading the picture in four segments
may actually take a little longer.
And don't forget, while that single 100KB picture is
downloading, other pictures on the same page can use the
other channels.
OK, I admit, when downloading a large file, there are time
gaps when the line is idle, and performing multiple
downloads at the same time may keep the line a little
busier. But this isn't a large factor.
Downloading many small files just isn't reliably faster
than downloading the same number of bytes in one large
file. The only change that makes a big difference is
decreasing the total download bytes for the entire page.
Jim Buyens
Microsoft FrontPage MVP
http://www.interlacken.com
Author of:
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