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diff --git a/INSTALL b/INSTALL
index 1ca2322..9568cda 100644
--- a/INSTALL
+++ b/INSTALL
@@ -186,10 +186,10 @@ does not work with some C++ compilers.
 
 =head1 Space Requirements
 
-The complete perl5 source tree takes up about 35 MB of disk space.
-After completing make, it takes up roughly 50 MB, though the actual
+The complete perl5 source tree takes up about 40 MB of disk space.
+After completing make, it takes up roughly 60 MB, though the actual
 total is likely to be quite system-dependent.  The installation
-directories need something on the order of 30 MB, though again that
+directories need something on the order of 35 MB, though again that
 value is system-dependent.
 
 =head1 Start with a Fresh Distribution
@@ -1408,7 +1408,7 @@ including a glossary of all those config.sh variables, is in the Porting
 subdirectory.  Especially Porting/Glossary should come in handy.
 
 Ports for other systems may also be available.  You should check out
-http://www.perl.com/CPAN/ports for current information on ports to
+http://www.cpan.org/ports for current information on ports to
 various other operating systems.
 
 If you plan to port Perl to a new architecture study carefully the
@@ -1925,6 +1925,15 @@ things like:  exec, `backquoted command`, system, open("|...") or
 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