November 30, 2007
Delta encoding (also called delta compression) is a way to update web pages by sending the "diffs" or deltas between versions of a web page. The server (proxy or origin) sends only what has changed in the page since the last access. This technique greatly reduces the amount of data that is sent from server to browser. In some cases with pages that change slightly, the deltas are on the order of a few TCP/IP packets. As about 32% of page accesses are first-time visits, about 68% of page visits are eligible for delta compression.
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November 19, 2007
Japan has the fastest broadband speeds and the lowest cost per megabit per second of all countries surveyed, according to recent data from the OECD (see Figures 1-3). Japan enjoys costs per megabit over four times lower than that of the US. Iceland fell three places from third to sixth in global broadband penetration from
Q4 2006 to Q2 2007, while the US remained at 15th place (see Figure 4). Ireland led all countries in net growth of broadband penetration per 100 inhabitants (see Figure 5). Meanwhile, in the US broadband penetration grew to 85.91% among active Internet users, up 0.6 percentage points over September 2007.
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