Need an actual graphic rather than a <pre>, but this was quick-and-dirty.
(faster) (marginally slower)
</pre>
+Or maybe a graph of demo results:
+<pre>
+ | B
+ 12|
+ |
+ |
+ |
+ |
+ |
+ |
+ | A B
+ 8 | B B B
+ |
+ |
+ |
+ t |
+ i |
+ m |
+ e | A A
+ 4 | A A
+ |
+ |
+ |
+ |
+ |
+ |
+ |
+ 0 +----------------------------------------------------------------
+ just WRITE WRITE_ZEROES blind FAST_ZERO FAST_ZERO
+ on every hole pre-zeroing missing supported
+</pre>
+
</p>