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Site for JavaScript reference hangs

If I go on following site, it takes > 5 seconds until the site reacts:

After an initial loading phase it seems to be fine.
Please optimize the loading of the site or provide an alternative
site that loads faster (e.g. without banner and without
links to Facebook and so on)

Since the issue occurs since a week it does not seem to be
a temporary issue and my internet connection also seems to
be fine.

If the low performance is due to the content navigation…
the content navigation (main menu on the left and sub menu
on the right) is not very intuitive to use in my opinion and should
be replaced.