diff --git a/.beads/interactions.jsonl b/.beads/interactions.jsonl
index 48dc9a7..8b37722 100644
--- a/.beads/interactions.jsonl
+++ b/.beads/interactions.jsonl
@@ -22,3 +22,4 @@
 {"id":"int-03ed1c823da90551f51a5a0d5691e440","kind":"field_change","created_at":"2026-08-28T12:35:29.257332022Z","actor":"Shinuwa","issue_id":"sokko-g-39h","extra":{"field":"status","new_value":"closed","old_value":"in_progress","reason":"Applied NDS event-surface to calendar week and month events, documented data-color/data-size, and validated checks."}}
 {"id":"int-88c39f90fdd5b81110acc4bdae55836c","kind":"field_change","created_at":"2026-09-10T11:49:36.768770213Z","actor":"Shinuwa","issue_id":"sokko-g-vfo","extra":{"field":"status","new_value":"closed","old_value":"in_progress","reason":"Shared lazy React registry consumed by toolbox and library; obsolete static import assertions removed; all 17 library types exercised; npm run check and 13 E2E tests pass."}}
 {"id":"int-7ec422ecc24735e12910a965567f32fe","kind":"field_change","created_at":"2026-09-10T12:17:38.573656548Z","actor":"Shinuwa","issue_id":"sokko-g-531","extra":{"field":"status","new_value":"closed","old_value":"in_progress","reason":"Concurrent image batches merge current data after compression; calendar selection handlers update drafts outside state updaters. Behavioral image test and reverse week/month selection E2E pass; npm run check passes."}}
+{"id":"int-1668982a1dda5d8304440ae699a32d40","kind":"field_change","created_at":"2026-09-10T12:22:11.969660039Z","actor":"Shinuwa","issue_id":"sokko-g-5u5","extra":{"field":"status","new_value":"closed","old_value":"in_progress","reason":"Recursive cache enabled for completed evaluations. Before: 131054 reads for 16 cells; after: 50 reads for 50 cells. Regression test failed before fix and passes after; npm run check and table persistence E2E pass."}}
diff --git a/tests/table-evaluation.test.mjs b/tests/table-evaluation.test.mjs
new file mode 100644
index 0000000..c71f63b
--- /dev/null
+++ b/tests/table-evaluation.test.mjs
@@ -0,0 +1,53 @@
+// Rôle : vérifie le coût des références répétées et les erreurs du tableau.
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { evaluateTable, evaluateTableCell } from "../website/src/features/toolboxes/modules/tableFormulaEngine.js";
+
+for (const reverse of [false, true]) {
+  test(`table reuses repeated references with ${reverse ? "forward" : "backward"} dependencies`, () => {
+    const count = 50;
+    const raw = { [reverse ? "A50" : "A1"]: "1" };
+    for (let i = 1; i < count; i++) {
+      const row = reverse ? count - i : i + 1;
+      const dependency = reverse ? row + 1 : row - 1;
+      raw[`A${row}`] = `=A${dependency}+A${dependency}`;
+    }
+    let reads = 0;
+    const cells = new Proxy(raw, {
+      get(target, address) {
+        // Stop an exponential regression before it can hang the test runner.
+        if (++reads > count * 4) throw new Error("Read budget exceeded");
+        return target[address];
+      }
+    });
+    const dimensions = { rows: count, columns: 1 };
+    const last = reverse ? "A1" : "A50";
+    assert.equal(evaluateTableCell(last, cells, dimensions).value, 2 ** 49);
+    assert.ok(reads <= count * 4);
+    reads = 0;
+    assert.equal(evaluateTable(cells, dimensions)[last].value, 2 ** 49);
+    assert.ok(reads <= count * 4);
+    raw[reverse ? "A50" : "A1"] = "2";
+    reads = 0;
+    assert.equal(evaluateTable(cells, dimensions)[last].value, 2 ** 50);
+  });
+}
+
+test("shared evaluation preserves cycle, division and invalid reference errors", () => {
+  const cells = {
+    A1: "=B1", B1: "=A1", C1: "=A1+1",
+    A2: "=1/0", B2: "=A2", C2: "=Z99",
+    A3: "text", B3: "=A3", C3: "=7+5"
+  };
+  const dimensions = { rows: 3, columns: 3 };
+  const result = evaluateTable(cells, dimensions);
+  assert.deepEqual(Object.fromEntries(Object.entries(result).map(([key, value]) => [key, value.error])), {
+    A1: "cycle", B1: "cycle", C1: "cycle",
+    A2: "division", B2: "reference", C2: "reference",
+    A3: "", B3: "reference", C3: ""
+  });
+  for (const address of Object.keys(cells)) {
+    assert.deepEqual(result[address], evaluateTableCell(address, cells, dimensions));
+  }
+  assert.equal(result.C3.value, 12);
+});
diff --git a/website/src/features/toolboxes/modules/tableFormulaEngine.js b/website/src/features/toolboxes/modules/tableFormulaEngine.js
index 0705e73..d51b078 100644
--- a/website/src/features/toolboxes/modules/tableFormulaEngine.js
+++ b/website/src/features/toolboxes/modules/tableFormulaEngine.js
@@ -166,17 +166,22 @@ export function evaluateTableCell(address, cells, dimensions, stack = []) {
 }
 
 function evaluateTableCellWithCache(address, cells, dimensions, stack, cache) {
-  if (!stack.length && cache.has(address)) return cache.get(address);
-  const raw = String(cells?.[address] || "").trim();
-  if (!raw) return { value: null, display: "", error: "empty" };
-
   if (stack.includes(address)) return { value: null, display: "#CYCLE", error: "cycle" };
+  if (cache.has(address)) return cache.get(address);
+  const raw = String(cells?.[address] || "").trim();
+  if (!raw) {
+    const evaluated = { value: null, display: "", error: "empty" };
+    cache.set(address, evaluated);
+    return evaluated;
+  }
 
   if (!raw.startsWith("=")) {
     const value = parsePlainNumber(raw);
-    return value == null
+    const evaluated = value == null
       ? { value: null, display: raw, error: "" }
       : { value, display: formatNumber(value), error: "" };
+    cache.set(address, evaluated);
+    return evaluated;
   }
 
   const result = evaluateFormula(raw.slice(1), (reference) => {
@@ -189,12 +194,12 @@ function evaluateTableCellWithCache(address, cells, dimensions, stack, cache) {
   if (result.error) {
     const label = result.error === "cycle" ? "#CYCLE" : result.error === "division" ? "#DIV/0" : "#ERREUR";
     const evaluated = { value: null, display: label, error: result.error };
-    if (!stack.length) cache.set(address, evaluated);
+    cache.set(address, evaluated);
     return evaluated;
   }
 
   const evaluated = { value: result.value, display: formatNumber(result.value), error: "" };
-  if (!stack.length) cache.set(address, evaluated);
+  cache.set(address, evaluated);
   return evaluated;
 }