diff --git a/TODO b/TODO
index 5569b4ee..f6cd948d 100644
--- a/TODO
+++ b/TODO
@@ -1,70 +1,8 @@
-- we currently have
-
-  reexamine cache sizing ... are they too large?
-
-  is thumbnail thinstrip or fatstrip? how does that affect seq cache sizing?
-
-  add something to linecache (and tilecache?) to get it to display cache size
-
-  sinkdisk could use a smaller wbuffer for thinstrip .. thinstrip * nthreads high
-  ... this would reduce the size of the input caches we need during shrink
-
-  same for fatstrip ... would it be less than tile-height? 
-
-  deprecate UNBUFFERED? it will probably not work now
-
-	* seq is on line 1000
-	* thread1 asks for line 2000 and blocks on seq->ready
-	* thread2 asks for line 2001 and also blocks
-	* thread1 times out and skips ahead to 2000
-	* thread1 wakes up thread2
-	* thread2 reads 2001
-
-  we could have 
-
-	* seq is on line 1000
-	* thread1 asks for line 2000 and blocks on seq->ready
-	* thread2 asks for line 2001 
-	* thread2 sees that another thread is blocked earlier, so there has 
-	  probably been a skip
-	* thread2 sets a "skipahead" flag, then wakes up thread1 and sleeps
-	  itself
-	* thread1 wakes, skips to 2000, wakes thread2 and returns
-	* thread2 wakes, reads 2001, and returns
-
-  we could keep a list of all the blocked threads, sorted by y request, then
-  only unblock the lowest numbered one when the whole threadpool is waiting
-
-  this sounds like the safest idea
-
-  we could get rid of the first tile is single-threaded hack as well
-
-  argh no, we may not ever get more than one thread blocked on a seq
-
-  we just have to get rid of seq and rely on a larger buffer behind the
-  processing point
-
-  use sinkdisk / sinkmemory to limit the amount that threads can get out of
-  sync ... we must stop starting new threads if an old thread is taking too
-  long to produce its tile
-
-  sinkdisk will do this automatically, since it only keeps two lines of tiles
-
-  sinkmemory will need to have something added
-
-
 - vips linecache has access there twice!
 
 	 $ vips linecache
 	 ...
 
-- make a test image with
-
-	make a huge 1 bit tiff in nip2, save 
-	put everything into one strip wih
-	tiffcp crazy.tif x.tif -s -r 93720 -c g4 
-
-
 - not sure about utf8 error messages on win
 
 - strange: