diff --git a/docs/PERFORMANCE_BACKLOG.md b/docs/PERFORMANCE_BACKLOG.md
index 070747c..a7e2e19 100644
--- a/docs/PERFORMANCE_BACKLOG.md
+++ b/docs/PERFORMANCE_BACKLOG.md
@@ -19,6 +19,7 @@ appview database.
 | `034ea59` | Hold reports blob size on read presigns; appview Stat no longer HEADs S3 for it. |
 | `f4343d7` | Blobs under 16MB go up as one presigned PUT; every upload is hashed and verified against its digest. |
 | `47a1070` | Process-wide budget on upload buffer memory; sweep for abandoned uploads; flush boundary pinned at exactly 16MB. |
+| `2a94f92` | Per-request memo of blob presigns; a blob GET is one hold call, not three (Stat, ServeBlob and the notification listener's Stat shared it). |
 
 In flight as of 2026-09-09: the registry reads the sailor profile from the
 local users row instead of the owner's PDS on every request, and part uploads
@@ -26,32 +27,6 @@ are pipelined so one part is in flight while the next fills.
 
 ## Remaining
 
-### Presign memoization within a request
-
-**Problem.** Every blob GET costs three hold calls, each doing full token
-validation, a captain record read and a presign. Distribution's blob handler
-calls `Stat` then `ServeBlob`, and distribution's notifications listener
-(`notifications.Listen` wraps every repository unconditionally, whether or not
-any endpoint is configured) calls `Stat` a third time after `ServeBlob` to
-build the pull event. Measured 2026-09-11 with `TestBenchRealImages`: a p90
-pull of 22 layers is 22 registry GETs and 66 hold calls, 44 of them HEAD
-presigns whose URL is never used.
-
-**Where.** `ProxyBlobStore.Stat` and `ServeBlob` in
-`pkg/appview/storage/proxy_blob_store.go`.
-
-**Fix.** The store is built per request, so a small memo keyed by digest and
-method inside it is safe. Stat reads the request method from the context
-(`storage.HTTPRequestMethod`, already set by the auth middleware), presigns
-for that method when it is GET or HEAD, and remembers the URL and size.
-ServeBlob reuses the URL when the digest and method match; the listener's
-second Stat is answered from the memo. S3 signs the HTTP method, so a HEAD
-URL cannot serve a GET; anything other than GET or HEAD must still presign
-HEAD, since the hold refuses `method=PUT` on the read path.
-
-**Impact.** One hold call per blob fetch instead of three. On the p90 pull
-that is 66 hold calls down to 22.
-
 ### Stat from the appview's own layers table
 
 **Problem.** For a layer of an already indexed manifest, the appview's `layers`