diff --git a/doc/todo/optimize_by_converting_String_to_ByteString.mdwn b/doc/todo/optimize_by_converting_String_to_ByteString.mdwn
index 13d29603fc..7ac7efe382 100644
--- a/doc/todo/optimize_by_converting_String_to_ByteString.mdwn
+++ b/doc/todo/optimize_by_converting_String_to_ByteString.mdwn
@@ -3,19 +3,26 @@ Converting to ByteString, and RawFilePath, should speed it up
 significantly, according to [[/profiling]].
 
 I've made a test branch, `bs`, to see what kind of performance improvement
-to expect. Most commands don't built yet in that branch, but `git annex
-find` does. Speedups range from 28-66%. The files fly by much more
-snappily.
+to expect. 
 
-As well as adding back all the code that was disabled to get it to build,
-the `bs` branch has quite a lot of things still needing work, including:
+Benchmarking `git-annex find`, speedups range from 28-66%. The files fly by
+much more snappily. Other commands likely also speed up, but do more work
+than find so the improvement is not as large.
+
+The `bs` branch is in a mergeable state now, but still needs work:
 
 * Eliminate all the fromRawFilePath, toRawFilePath, encodeBS,
   decodeBS conversions. Or at least most of them. There are likely
   quite a few places where a value is converted back and forth several times.
 
-  It would be good to instrument them with Debug.Trace and find out which
-  are the hot ones that get called, and focus on those.
+  As a first step, profile and look for the hot spots. Known hot spots:
+  
+  * keyFile uses fromRawFilePath and that adds around 3% overhead in `git-annex find`. 
+    Converting it to a RawFilePath needs a version of `</>` for RawFilePaths.
+  * getJournalFileStale uses fromRawFilePath, and adds 3-5% overhead in
+    `git-annex whereis`. Converting it to RawFilePath needs a version 
+    of `</>` for RawFilePaths. It also needs a ByteString.readFile
+    for RawFilePath.
 
 * System.FilePath is not available for RawFilePath, and many of the
   conversions are to get a FilePath in order to use that library.
@@ -28,7 +35,3 @@ the `bs` branch has quite a lot of things still needing work, including:
   avoiding a conversion. Note that these are only available on unix, not
   windows, so a compatability shim will be needed.
   (I can't seem to find any library that provides one.)
-
-* Eliminate some Data.ByteString.Lazy.toStrict, which is a slow copy.
-
-* Use ByteString for parsing git config to speed up startup.