diff --git a/lib/forth/compiler.sx b/lib/forth/compiler.sx
index 8a9e7300..1d744ce3 100644
--- a/lib/forth/compiler.sx
+++ b/lib/forth/compiler.sx
@@ -34,6 +34,10 @@
 ;; to the prior X — matching standard Forth redefinition semantics.
 ;; RECURSE is the one exception: it stays late-bound against the not-yet-
 ;; installed current definition.
+;; Inline primitive calls: skip the `forth-execute-word` indirection by
+;; appending the word's body fn directly (forth-execute-word body
+;; reduces to `((get w "body") state)`, which is exactly what the body
+;; fn already is). Saves one frame per call op in every colon-def.
 (define
   forth-compile-call
   (fn
@@ -43,9 +47,7 @@
       (if
         (nil? w)
         (forth-error state (str name " ?"))
-        (let
-          ((op (fn (s) (forth-execute-word s w))))
-          (forth-def-append! state op))))))
+        (forth-def-append! state (get w "body"))))))
 
 (define
   forth-compile-recurse
diff --git a/lib/forth/scoreboard.json b/lib/forth/scoreboard.json
index 104667a0..5f7d0569 100644
--- a/lib/forth/scoreboard.json
+++ b/lib/forth/scoreboard.json
@@ -1,6 +1,6 @@
 {
   "source": "gerryjackson/forth2012-test-suite src/core.fr",
-  "generated_at": "2026-04-25T03:32:23Z",
+  "generated_at": "2026-04-25T04:00:01Z",
   "chunks_available": 638,
   "chunks_fed": 638,
   "total": 638,
diff --git a/lib/forth/scoreboard.md b/lib/forth/scoreboard.md
index 076789e1..ad1b1fc6 100644
--- a/lib/forth/scoreboard.md
+++ b/lib/forth/scoreboard.md
@@ -11,7 +11,7 @@
 | percent           | 96% |
 
 - **Source**: `gerryjackson/forth2012-test-suite` `src/core.fr`
-- **Generated**: 2026-04-25T03:32:23Z
+- **Generated**: 2026-04-25T04:00:01Z
 - **Note**: completed
 
 A "chunk" is any preprocessed segment ending at a `}T` (every Hayes test
diff --git a/plans/forth-on-sx.md b/plans/forth-on-sx.md
index 5c79cd7d..243830a2 100644
--- a/plans/forth-on-sx.md
+++ b/plans/forth-on-sx.md
@@ -98,7 +98,7 @@ Representation:
 - [x] Target: 100% Hayes Core (97% achieved — remaining 5 errors all in `GI5`'s multi-`WHILE`-per-`BEGIN` non-standard pattern, plus one stuck `dict-set!` chunk and 14 numeric-edge fails)
 
 ### Phase 6 — speed
-- [ ] Inline primitive calls during compile (skip dict lookup)
+- [x] Inline primitive calls during compile (skip dict lookup)
 - [ ] Tail-call optimise colon-def endings
 - [ ] JIT cooperation: mark compiled colon-defs as VM-eligible
 
@@ -106,6 +106,17 @@ Representation:
 
 _Newest first._
 
+- **Phase 6 — inline primitive calls (Hayes unchanged at 618/638).**
+  `forth-compile-call` now appends the looked-up word's body fn
+  directly to the colon-def body instead of wrapping it in
+  `(fn (s) (forth-execute-word s w))`. `forth-execute-word body`
+  reduces to `((get w "body") state)`, so the wrapper added an
+  extra closure + `get` per call op for no behavioural gain. Same
+  early-binding semantics: the body fn is captured at compile time,
+  so later redefinitions of the same name don't retroactively
+  change existing definitions. All 306 internal tests still green;
+  Hayes Core stays at 618/638. Pure optimisation.
+
 - **Phase 5 close — `\` no-op + POSTPONE-immediate split + `>NUMBER` +
   `DOES>`; Hayes 486→618 (97%).** Big closing-out iteration.
   Made `\` IMMEDIATE so `POSTPONE \` (Hayes' IFFLOORED/IFSYM gate)