open("...|"). All these mean that Perl is trying to run some
external program.
+=item Timing problems
+
+Several tests in the test suite check timing functions, such as
+sleep(), and see if they return in a reasonable amount of time.
+If your system is quite busy and doesn't return quickly enough,
+these tests might fail. If possible, try running the tests again with
+the system under a lighter load. These tests include F<t/op/alarm.t>,
+F<ext/Time/HiRes/HiRes.t>, and F<lib/Benchmark.t>.
+
=item Out of memory
On some systems, particularly those with smaller amounts of RAM, some