diff --git a/TODO.org b/TODO.org
index 68c2fc24..a81294e6 100644
--- a/TODO.org
+++ b/TODO.org
@@ -774,7 +774,8 @@ One spelling for one operation; != stays, and not= is refused with a suggestion
 of !=.
 
 * Checker
-** TODO Checking a wide fold of let operands is slow
+** WAIT Checking a wide fold of let operands is slow
+Parked 2026-09-26: design first; remeasure on a quiet machine, it was timed under load 20.
 A 2000-operand (bit-and (let …) …) takes 32 s to check (37 s before the bit operators);
 2000 plain names take 0.03 s. Something per operand is quadratic or worse.
 
@@ -1578,7 +1579,8 @@ are a dyn vector, except numbers with no common type, which are refused. Rules
 out the first element typing the rest.
 
 * Dev loop
-** TODO --dev bookkeeping per temp allocation grows without free-temp
+** WAIT --dev bookkeeping per temp allocation grows without free-temp
+Parked 2026-09-26: design first.
 Under --dev each temp allocation (i64->bytes, dyn text crossing into str) costs about
 340 bytes of registry notes until free-temp; a loop passing dyn text as str 4M times
 without free-temp reaches 2.7 GB. Release stays flat. A CLI that never frees temp hits it.
@@ -2099,6 +2101,9 @@ default is left alone. Rules out relabelling a note as a warning to make it
 navigable.
 
 * Docs and the repository
+** WAIT dune test runs slowly and is not grouped by module
+Parked 2026-09-26: design first. Time each test by CPU on a quiet machine, speed up the
+slowest ten, and group tests under per-module aliases so a lane runs only its own.
 
 ** DONE The reference page says what the language is
 CLOSED: [2026-09-21]