17:55 Monday 19. December 2005
A shot of the cathedral in Cologne through the glass window of the train station with reflection of stars.
With the right SIM card and a good wireless
data tariff such as the prepaid offer of the Italian operator WIND, the mobile
traveler can surf the net these days anytime and anywhere. Costs are moderate
and a GPRS/EDGE or UMTS networks can be found almost everywhere. While the web
surfing experience with UMTS is close to that of DSL, EDGE and especially GPRS
can not quite compete with a high speed fixed Internet access. For such slower
connections, a number of manual Firefox browser settings can make a big
difference.
A very effective method to speed-up the web
browser is ‘Pipelining’. If enabled, several embedded elements of a web page,
such as pictures, are requested at once after opening a TCP stream instead of being
requested one after another. This decreases download times when using GPRS or
EDGE, as fewer TCP connections are required to download a web page. Fewer TCP
connections reduce the effect of longer round trip delay times of GPRS and EDGE
compared to fixed line Internet connections. More detailed background
information can be found here: http://www.mozilla.org/projects/netlib/http/pipelining-faq.html
Activation of Pipelining in Firefox:
The Result:
A test with
an extensive web page and previously deleted browser cache at first shows no
difference in the time it takes to show the first part of web page. A big
difference can be observed, however, in the time it takes to load the complete
page. Instead of 60 seconds for loading the complete web page, the modified
browser settings decreased the required time to 40 seconds!