The present invention describes a system and method for ascertaining and displaying
connection-related performance data. Performance data in networks, in particular
in the application area of WWW applications, such as web browsers, for example,
is ascertained and displayed. The technical feasibility of expanding HTML documents
retrospectively to include performance data, such as loading speed or time, is
integrated into the layout of the referenced document. The performance data can
be expanded in a proxy, which adds a loading speed or time to be expected to the
document to be forwarded.