diff --git a/3. Coexistence with Legacy IPv4/IPv6 primary differences from IPv4.md b/3. Coexistence with Legacy IPv4/IPv6 primary differences from IPv4.md
index 5387114..8017f16 100644
--- a/3. Coexistence with Legacy IPv4/IPv6 primary differences from IPv4.md	
+++ b/3. Coexistence with Legacy IPv4/IPv6 primary differences from IPv4.md	
@@ -71,6 +71,17 @@ The primary differences are:
 The list above is not comprehensive, but the other differences are
 probably smaller.
 
+An obvious question is: With all these differences, what is the difference
+in performance between IPv6 and IPv4? There is no simple answer to this
+question. Since the IPv6 packet header is 20 bytes larger than for IPv4,
+the raw payload throughput of a link carrying full sized IPv6 packets
+is slightly less than for IPv4 (about 1.3% less for 1500 byte packets).
+However, many other factors come into play and measurements
+often show better end-to-end performance for IPv6. For example,
+in most countries [Google statistics](https://www.google.com/intl/en/ipv6/statistics.html#tab=per-country-ipv6-adoption)
+show lower latency (transit time) for IPv6. The safest summary
+is that there is no significant performance difference.
+
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