A note on McAfee virusscanner and R2 (slow response)

[Jan Koster]

A note on McAfee virusscanner and R2 (slow response)

R2 makes heavy use of javascript in nearly all of its plots. This
provides the hoover information and makes the images interactive. Some
virus scanners will check (java)scripts for the presence of malicious
code before they are presented to the user. For some plots in R2 the
amount of scripts can run into 10.000-60.000 on a single page.
Examples of these are heatmaps or the 2groups plotter. Especially
McAfee will take extremely long to check all these scripts before
releasing the page (sometimes over 60 sec). We cannot circumvent the
McAfee software programmatically. You are advised to switch off the
scriptscanner in the McAfee software while you are using functionality
relying heavily on scripts within R2.

You can recognize this scripscanner problem by noting that timers
within R2 are no longer updating by the second, but seem to be frozen.

Disabling ScriptScanner within McAfee may be temporary, meaning that
it will automatically switch on after a small amount of time,
depending on your settings and/or access rights for the virus scanner
software.

Note that we are aware of this behaviour for McAfee. We also know that
this behaviour is not seen in AVG(free) for example. For other virus
scanners we do not have sufficient information at this time.

Jan.