Ah, 215 is definitely a big step in the right direction :-)
It's still re-scanning the queue unnecessarily, but at least it's doing so in a much more sensible manner.
Let me show you what kind of things were happening with 214:
Time of Day Operation Path Detail
18:45:20.5794889 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
18:45:20.5795171 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
18:45:20.5795304 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 2, Length: 1, Priority: Normal
18:45:20.5795402 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 3, Length: 1, Priority: Normal
18:45:20.5795496 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 4, Length: 2, Priority: Normal
18:45:20.5795632 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 6, Length: 10,385, Priority: Normal
18:45:20.5795995 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 10,391, Length: 1, Priority: Normal
18:45:20.5796103 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 10,392, Length: 1, Priority: Normal
18:45:20.5796198 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 10,393, Length: 2, Priority: Normal
18:45:20.5796299 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 20,697, Length: 1, Priority: Normal
18:45:20.5796411 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 20,698, Length: 1, Priority: Normal
18:45:20.5796505 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 20,699, Length: 2, Priority: Normal
18:45:20.5796606 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21,275, Length: 1, Priority: Normal
18:45:20.5796700 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21,276, Length: 1, Priority: Normal
18:45:20.5796802 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21,277, Length: 2, Priority: Normal
18:45:20.5796913 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21,279, Length: 693, Priority: Normal
18:45:20.5797043 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21,972, Length: 1, Priority: Normal
18:45:20.5797140 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21,973, Length: 1, Priority: Normal
18:45:20.5797231 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21,974, Length: 2, Priority: Normal
18:45:20.5797332 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21,988, Length: 1, Priority: Normal
18:45:20.5797465 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21,989, Length: 1, Priority: Normal
18:45:20.5797563 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21,990, Length: 2, Priority: Normal
18:45:20.5797664 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,122, Length: 1, Priority: Normal
18:45:20.5797783 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,123, Length: 1, Priority: Normal
18:45:20.5797877 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,124, Length: 2, Priority: Normal
18:45:20.5797978 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,141, Length: 1, Priority: Normal
18:45:20.5798072 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,142, Length: 1, Priority: Normal
18:45:20.5798167 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,143, Length: 2, Priority: Normal
18:45:20.5798268 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,147, Length: 1, Priority: Normal
18:45:20.5798362 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,148, Length: 1, Priority: Normal
18:45:20.5798456 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,149, Length: 2, Priority: Normal
18:45:20.5798558 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,567, Length: 1, Priority: Normal
18:45:20.5798652 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,568, Length: 1, Priority: Normal
18:45:20.5798743 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,569, Length: 2, Priority: Normal
18:45:20.5798844 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22,581, Length: 1, Priority: Normal
18:45:20.5801933 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
18:45:20.5802164 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 12, Length: 1, Priority: Normal
18:45:20.5802310 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 13, Length: 1, Priority: Normal
18:45:20.5802464 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 16, Length: 1, Priority: Normal
18:45:20.5802642 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 17, Length: 1, Priority: Normal
18:45:20.5802792 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 18, Length: 1, Priority: Normal
18:45:20.5802939 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 19, Length: 1, Priority: Normal
18:45:20.5803085 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 20, Length: 1, Priority: Normal
18:45:20.5803225 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 21, Length: 1, Priority: Normal
18:45:20.5803368 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 22, Length: 1, Priority: Normal
18:45:20.5803508 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 23, Length: 1, Priority: Normal
18:45:20.5803651 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 24, Length: 1, Priority: Normal
18:45:20.5803801 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 25, Length: 1, Priority: Normal
18:45:20.5803944 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 26, Length: 1, Priority: Normal
18:45:20.5804087 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 27, Length: 1, Priority: Normal
18:45:20.5804234 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 28, Length: 1, Priority: Normal
18:45:20.5804391 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 29, Length: 1, Priority: Normal
18:45:20.5804534 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 30, Length: 1, Priority: Normal
18:45:20.5804670 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 31, Length: 1, Priority: Normal
18:45:20.5804810 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 32, Length: 1, Priority: Normal
18:45:20.5804949 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 33, Length: 1, Priority: Normal
18:45:20.5805089 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 30, Length: 1, Priority: Normal
18:45:20.5805229 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 31, Length: 1, Priority: Normal
18:45:20.5805375 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 62, Length: 1, Priority: Normal
18:45:20.5805511 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 63, Length: 1, Priority: Normal
18:45:20.5805651 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 64, Length: 1, Priority: Normal
18:45:20.5805791 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 65, Length: 1, Priority: Normal
18:45:20.5805934 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 66, Length: 1, Priority: Normal
18:45:20.5806073 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 67, Length: 1, Priority: Normal
18:45:20.5806213 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 68, Length: 1, Priority: Normal
18:45:20.5806353 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 69, Length: 1, Priority: Normal
18:45:20.5806503 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 34, Length: 1, Priority: Normal
18:45:20.5806642 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 35, Length: 1, Priority: Normal
18:45:20.5806785 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 36, Length: 1, Priority: Normal
18:45:20.5806925 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 37, Length: 1, Priority: Normal
18:45:20.5807065 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 38, Length: 1, Priority: Normal
18:45:20.5807204 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 39, Length: 1, Priority: Normal
18:45:20.5807354 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 40, Length: 1, Priority: Normal
18:45:20.5807494 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 41, Length: 1, Priority: Normal
18:45:20.5807637 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 42, Length: 1, Priority: Normal
18:45:20.5807777 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 43, Length: 1, Priority: Normal
18:45:20.5807916 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 44, Length: 1, Priority: Normal
18:45:20.5808053 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 45, Length: 1, Priority: Normal
18:45:20.5808196 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 42, Length: 1, Priority: Normal
18:45:20.5808335 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 43, Length: 1, Priority: Normal
and that's just a tiny fragment!
Now, with 215 we have,
Time of Day Operation Path Detail
23:38:07.9378463 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:07.9378735 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:07.9385815 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:07.9436177 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:07.9450461 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:07.9450636 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:07.9455425 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 50, Priority: Normal
23:38:07.9458382 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:07.9512225 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:07.9546062 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:09.1516328 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:09.1516751 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:09.1527174 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:09.1576423 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:09.1587981 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:09.1588152 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:09.1597358 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 50, Priority: Normal
23:38:09.1601899 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:09.1661156 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:09.1702149 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:09.4348676 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 50, Priority: Normal
23:38:09.4351559 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:09.4413609 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:09.4439406 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:10.2167168 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 50, Priority: Normal
23:38:10.2170013 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:10.2221143 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:10.2245474 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:10.3924214 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-104414-0002.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:10.3941661 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-104414-0002.jpg Offset: 0, Length: 2, Priority: Normal
23:38:10.3974841 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-104320-0001.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:10.3995682 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-104320-0001.jpg Offset: 0, Length: 2, Priority: Normal
23:38:10.4028778 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-113048-0003.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:10.4048243 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-113048-0003.jpg Offset: 0, Length: 2, Priority: Normal
23:38:10.4087316 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-113458-0004.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:10.4116936 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-113458-0004.jpg Offset: 0, Length: 2, Priority: Normal
23:38:10.4151216 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:10.4188303 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144212-0005.jpg Offset: 0, Length: 2, Priority: Normal
23:38:10.4222834 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144427-0006.jpg Offset: 0, Length: 1,024, Priority: Normal
23:38:10.4258465 ReadFile C:\Users\steve\Pictures\Malta 2014\20140221-144427-0006.jpg Offset: 0, Length: 2, Priority: Normal
Still some redundancy in the reading but far less! It's still noticeably less snappy than 137 but definitely back in the realm of usability :-)