I have also come across this problem, the restlet client chooses between using
simpledateformat and internetdateformat depending on the format of the date
header passed to it. simpledateformat is slow because it loads all the timezone
names for each instance.
It is possible that if your server uses internetdateformat for its date headers
then the client will too but I have not been able to actually confirm this yet
The decision code is in DateUtils.parse
if (FORMAT_RFC_3339.get(0).equals(format)) {
parser = new InternetDateFormat(TIMEZONE_GMT);
} else {
parser = new java.text.SimpleDateFormat(format,
java.util.Locale.US);
parser.setTimeZone(TIMEZONE_GMT);
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