Index: xml/en/encoding-guide.xml
===================================================================
--- xml/en/encoding-guide.xml (revision 21914)
+++ xml/en/encoding-guide.xml (working copy)
@@ -3658,7 +3658,8 @@
This is usually enough to be visible.
- is the slowest, highest quality mode.
+ is slower and yields better quality at a reasonable
+ cost.
In comparison to , it usually gains 0.1-0.4 dB
global PSNR with speed costs varying from 25%-100%.
Unlike other levels of , the behavior of
@@ -3670,6 +3671,14 @@
in low-motion scenes. Note that it is still recommended to always set
to something other than zero (see below).
+
+ is the slowest, highest quality mode.
+ In comparison to , it usually gains 0.01-0.05 dB
+ global PSNR with speed costs varying from 15%-33%.
+ Because this introduces a significant slowdown without a significant
+ improvement in quality, it is not recommend to use it unless you're
+ after every bit of quality improvement.
+