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Difference between Web Application Streaming Network and Content Delivery Network


Web Application Streaming Network is a replacement to Content Delivery Network (CDN) and is different in many ways. Read this presentation to understand from Instart Logic's explanation on the core difference between Web Application Streaming Network and Content Delivery Network. Get your Content Delivery Network replacement from Instart Logic: – PowerPoint PPT presentation

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Title: Difference between Web Application Streaming Network and Content Delivery Network

Since the day Gartner VP of research, Lydia
Leong, wrote that the Web Application Streaming
Network is a replacement for a content delivery
network (CDN) we have received many questions
about the differences between the two
technologies and the problems each aims to solve.
They are two fundamentally different
technologies. But since many web publishers
already use some CDN, it can serve as a reference
point for learning about Web Application
Streaming, a new, much-needed technology that
comes just in time for the latest generation of
ultra-rich and interactive websites and web
applications being accessed via wireless
networks. Here are the four main differences we
highlight in this blog post. Having a modern
focus that includes mobile and wireless last mile
networks, adopting a radical new approach that
streams a portion of the data vs. requiring a
full up front download, moving the Intelligence
beyond the network layer to the application
layer, and by extending its reach beyond
cloud-only CDN solutions to a unique client-cloud
architecture using virtualization in the browser.
Lets drill into each in a bit more detail.
Content Delivery Networks solve yesterdays
Internet problem. They were originally developed
over 10 years ago when latency and routing issues
in the core middle mile of the Internet were
the most significant barriers to fast website
delivery. CDNs work primarily by keeping copies
of frequently accessed images, scripts, and other
web site components cached closer to users in
the edge of ISP networks. CDNs at the time were
effective at solving core middle mile Internet
latency issues back when users were all accessing
the Internet over wired connections to their ISPs
on desktop systems. Now core middle mile
bottlenecks that existed 10 years ago have
shifted beyond the reach of CDNs past the edge of
the ISP networks into the new wireless last
mile networks. These new bottlenecks are now on
the wireless (3G, 4G, and WiFi) last mile
connections that exist between end users and
their ISPs. CDNs were never designed to address
the modern challenges in this new world of mobile
devices connecting via wireless networks.
Web Application Streaming was designed thinking
mobile first to address the challenges of sending
web sites and applications to mobile users over
wireless last mile networks. It provides a full
end-to-end solution that enables faster web
experiences from the customers origin web
servers all the way to the user on an iPad in
Starbucks or a laptop-toting traveler at an
airport hot spot. Web application streaming
accelerates user experiences over every mile as
an end-to-end solution for todays Internet
delivery challenges that replaces legacy CDN
Content Delivery Networks need to completely
download a web application before it can be
displayed and the user can interact with the
application. This is a key distinction, because
with Web Application Streaming, users can view
and interact when only a partial download of the
application has occurred. Web application
streaming divides web applications into smaller
fragments and then intelligently streams the most
important portions of the application to the
browser first. The remainder of the application
then continues to stream down in the background,
while the user is already interacting with the
web experience. As a result the customers wait
time is dramatically reduced. From a users
viewpoint, the single most important metric is
not full page load times. There is growing
recognition that the user experience is more
impacted by the wait until the moment when the
app loads and first becomes interactive, a.k.a.
the time to display. In other words, How fast
can I view, click and do something? Some call
this time to first interaction. Web application
streaming is designed to reduce the time it takes
to get users engaged, not just total download
The Web Application Streaming Network knows what
is flowing through its systems and has a deep
understanding of websites and apps and how they
load in web browsers. CDNs do not. A fundamental
limitation of CDNs is that they operate at the
network level. They were built to overcome the
effects of latency by keeping copies of data
closer to users and using TCP acceleration to
speed raw data transfer. They are not designed to
understand the 1s and 0s going across them. And
they dont know or understand which parts of a
web site or application are most important to
getting the user started and clicking. As a
result, CDNs have to send considerably more data
up front, before a browser can parse the
information and display it to the end user. As
the size of websites and applications continues
to grow, this only adds to modern performance
challenges. Web Application Streaming, by
contrast, works at the application layer and is
able to make intelligent decisions about the data
being sent to web browsers. Awareness of various
different content formats is built into the Web
Application Streaming Network. For example, with
a deep understanding of how a .JPG and a .PNG
image differ at the byte level, it can determine
what bytes per image to send up front for the
initial page paint and what bytes can be sent in
the background while the user is already in the
site or application. And in the case of HTML
itself the system can determine which parts of
dynamic HTML are actually the same across all
users and send that while user specific HTML is
still being generated by the backend web servers.
Content delivery networks use a cloud-only
architecture, confined to operating in the
backend of the Internet, without the ability to
reach beyond the edge of ISP networks. As a
result, even the most advanced CDNs can only
guess about the conditions on the end users
systems. Instart Logics Web Application
Streaming is built on top of an innovative
client-cloud architecture. A thin transparent
client called NanoVisor.js, built in JavaScript,
uses virtualization technology to run
transparently between the executing website or
application and the browsers various APIs and
caches. Its completely transparent to the end
user and requires no changes by web publishers to
deploy. It allows standard web browsers to
receive a web application as a stream and run it
even when only a portion of all fragments have
been downloaded. The Nanovisor also works with a
cloud based component called the Personalized
AppSequencer. The AppSequencer analyzes web
application load and execution profiles and
determines which components are highest-priority,
meaning are they needed by the user to get
started? The AppSequencer then uses that
knowledge to send the components in the optimal
order to the end users browsers. Those are the
biggest differences we talk about, but there are
many more. If you are looking for even more
detail, we invite you to read our technical
whitepaper or better yet, contact us for a free
trial and see how we can dramatically improve
your web page load times.
Visit our Blog to learn more
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