<p>
It depends on the nature of your program.
-Programs that contain several goroutines that spend a lot of time
-communicating on channels will experience performance degradation when using
-multiple OS threads. This is because of the significant context-switching
-penalty involved in sending data between threads.
+Problems that are intrinsically sequential cannot be sped up by adding
+more goroutines.
+Concurrency only becomes parallelism when the problem is
+intrinsically parallel.
+</p>
+
+<p>
+In practical terms, programs that spend more time
+communicating on channels than doing computation
+will experience performance degradation when using
+multiple OS threads.
+This is because sending data between threads involves switching
+contexts, which has significant cost.
+For instance, the <a href="/doc/go_spec.html#An_example_package">prime sieve example</a>
+from the Go specification has no significant parallelism although it launches many
+goroutines; increasing <code>GOMAXPROCS</code> is more likely to slow it down than
+to speed it up.
</p>
<p>