The alternative AJAX Nevron Instant Callback technology is based on image
refresh, rather than on ASP.NET 2.0 AJAX asynchronous callbacks. With the
Nevron Instant Callback technology the performance of the component can
be increased several times, depending on the complexity of the page it
is hosted within. Even in the most simple scenario (a web form with one
chart control) the processing of the standard callback request by IIS
adds 55% to the time, required by the server to render a chart. In a web
form with many ASP.NET controls the overhead can be as high as 350% and
even higher. This can be a concern for web sites that use AJAX because
AJAX-enabled web controls tend to create a very intensive client-server
request flow.
The Nevron Instant Callback does not create a request context at
server side when an event is routed from the client to the server, thus
removing the 55% - 350% processing time overhead. This way the processing
time of the callback requests is decreased dramatically and more clients can
connect to your web server per minute.
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