diff --git a/backend/routers/causal_lab.py b/backend/routers/causal_lab.py
index 548da91..7ae4818 100644
--- a/backend/routers/causal_lab.py
+++ b/backend/routers/causal_lab.py
@@ -134,24 +134,25 @@ def _fetch_prices(event_date_str: str, instruments: list[str]) -> dict:
     return out
 
 
-def _drift_metrics(prices: dict, event_date_str: str, inst: str) -> dict:
+def _drift_metrics(prices: dict, event_date_str: str, inst: str, lag_min: int = 0) -> dict:
     series = prices.get(inst, [])
     mode   = prices.get("mode", "none")
     edate  = event_date_str[:10]
 
-    empty = {"pre_pips": None, "post_pips": None, "drift_ratio": None, "leak": "unknown"}
+    empty = {"pre_pips": None, "post_pips": None, "drift_ratio": None, "leak": "unknown", "lag_min": lag_min}
     if not series:
         return empty
 
+    mult = 10000 if inst in ("EURUSD",) else 10
     if mode == "intraday_5m":
         n = len(series)
         if n < 8:
             return empty
-        mid = n // 2
-        # Convertir en pips (×10000 pour FX, ×10 pour or/pétrole/SP500)
-        mult = 10000 if inst in ("EURUSD",) else 10
-        pre_pips  = round((series[mid - 1]["c"] - series[0]["c"])   * mult)
-        post_pips = round((series[-1]["c"]       - series[mid]["c"]) * mult)
+        # Décale le mid en avant selon le lag (chaque barre = 5 min)
+        lag_bars = max(0, round(lag_min / 5))
+        mid = min(n // 2 + lag_bars, n - 2)
+        pre_pips  = round((series[mid - 1]["c"] - series[0]["c"]) * mult)
+        post_pips = round((series[-1]["c"] - series[mid]["c"]) * mult)
     else:
         pre  = [b for b in series if b["t"] <  edate]
         same = [b for b in series if b["t"] == edate]
@@ -760,6 +761,15 @@ def analyze_event(body: AnalyzeRequest):
         # Évaluation du graphe
         node_values = evaluate_graph(graph, inputs, body.coef_overrides or {})
 
+        # Lag effectif : max des lag_min sur toutes les arêtes menant à un market_asset
+        edges     = graph.get("edges", [])
+        nodes_map = {n["id"]: n for n in graph.get("nodes", [])}
+        output_ids = {n["id"] for n in graph.get("nodes", []) if n.get("type") in ("market_asset", "output")}
+        effective_lag = max(
+            (e.get("lag_min", 0) or 0 for e in edges if e.get("to") in output_ids),
+            default=0,
+        )
+
         # Prix réels
         instruments = list({body.instrument} | set(tmpl.get("instruments", [body.instrument])))
         prices = _fetch_prices(event["start_date"], instruments)
@@ -768,7 +778,7 @@ def analyze_event(body: AnalyzeRequest):
         actual_moves: dict = {}
         drift_by_inst: dict = {}
         for inst in instruments:
-            drift = _drift_metrics(prices, event["start_date"], inst)
+            drift = _drift_metrics(prices, event["start_date"], inst, lag_min=effective_lag)
             drift_by_inst[inst] = drift
             if drift.get("post_pips") is not None:
                 actual_moves[inst] = drift["post_pips"]
@@ -786,18 +796,19 @@ def analyze_event(body: AnalyzeRequest):
         analyzed_at = datetime.utcnow().strftime("%Y-%m-%dT%H:%M:%SZ")
 
         result = {
-            "event":         event,
-            "template_id":   body.template_id,
-            "template_name": tmpl["name"],
-            "instrument":    body.instrument,
-            "inputs":        inputs,
-            "node_values":   node_values,
-            "actual_moves":  actual_moves,
-            "yields":        yields,
-            "activation":    activation,
-            "drift":         drift_by_inst.get(body.instrument, {}),
-            "prices_mode":   prices.get("mode", "none"),
-            "analyzed_at":   analyzed_at,
+            "event":              event,
+            "template_id":        body.template_id,
+            "template_name":      tmpl["name"],
+            "instrument":         body.instrument,
+            "inputs":             inputs,
+            "node_values":        node_values,
+            "actual_moves":       actual_moves,
+            "yields":             yields,
+            "activation":         activation,
+            "drift":              drift_by_inst.get(body.instrument, {}),
+            "prices_mode":        prices.get("mode", "none"),
+            "effective_lag_min":  effective_lag,
+            "analyzed_at":        analyzed_at,
         }
 
         # Persistance
diff --git a/frontend/src/pages/CausalLab.tsx b/frontend/src/pages/CausalLab.tsx
index d993341..53db8d5 100644
--- a/frontend/src/pages/CausalLab.tsx
+++ b/frontend/src/pages/CausalLab.tsx
@@ -18,9 +18,12 @@ export interface CausalEdge {
   from: string; to: string
   style: 'solid' | 'dashed'
   type?: string
-  strength?: 1 | 2 | 3    // 1=fin, 2=normal, 3=épais
+  strength?: 1 | 2 | 3
   sign?: 'positive' | 'negative' | 'neutral'
   label?: string
+  lag_min?: number        // délai avant onset (minutes, 0 = immédiat)
+  diffusion_min?: number  // durée jusqu'à absorption complète (minutes)
+  decay_days?: number | null // demi-vie (jours), null = shift permanent
 }
 interface Coefficient { value: number; calibrated: number | null; description: string }
 interface InputMapping {
@@ -61,7 +64,7 @@ interface AnalysisResult {
   actual_moves: Record<string, number>; yields: Record<string, number | null>
   activation: { score: number | null; nodes: Record<string, NodeResult>; correct: number; total: number }
   drift: { pre_pips: number | null; post_pips: number | null; drift_ratio: number | null; leak: string }
-  prices_mode: string; analyzed_at: string
+  prices_mode: string; analyzed_at: string; effective_lag_min?: number
 }
 interface Recommendation {
   template_id: number | null; template_name: string; confidence: number
@@ -106,6 +109,15 @@ const edgeColor = (sign?: string): string => ({
 /** Épaisseur selon strength */
 const edgeWidth = (s?: number) => s === 1 ? 1 : s === 3 ? 3.5 : 2
 
+/** Format lag minutes → "+5m" / "+2h" / "+3j" */
+function fmtLag(min: number): string {
+  if (min < 60)   return `+${min}m`
+  if (min < 1440) return `+${(min / 60).toFixed(0)}h`
+  return `+${(min / 1440).toFixed(0)}j`
+}
+/** Format decay days → "↩3j" */
+const fmtDecay = (d: number) => `↩${d}j`
+
 const CAT_LABELS: Record<string, string> = {
   macro_us: 'Macro US', macro_eu: 'Macro EU', geopolitical: 'Géopolitique',
   commodity: 'Matières premières', report: 'Report', sentiment: 'Sentiment',
@@ -166,6 +178,18 @@ export function GraphSVG({
     return `M${x1},${y1} C${x1},${my} ${x2},${my} ${x2},${y2}`
   }
 
+  function bezierPt(e: CausalEdge, t0: number): { x: number; y: number } | null {
+    const s = nodeMap[e.from]; const t = nodeMap[e.to]
+    if (!s || !t) return null
+    const x1 = s.x; const y1 = s.y + NH / 2
+    const x2 = t.x; const y2 = t.y - NH / 2
+    const my = (y1 + y2) / 2
+    const dx = x2 - x1; const dy = y2 - y1; const len = Math.sqrt(dx*dx + dy*dy) || 1
+    const bx = (1-t0)**3*x1 + 3*(1-t0)**2*t0*x1 + 3*(1-t0)*t0**2*x2 + t0**3*x2
+    const by = (1-t0)**3*y1 + 3*(1-t0)**2*t0*my + 3*(1-t0)*t0**2*my + t0**3*y2
+    return { x: bx + (-dy/len)*10, y: by + (dx/len)*10 }
+  }
+
   // Label position: 1/3 of the way from source (avoids node centers)
   function edgeLabelPos(e: CausalEdge): { x: number; y: number } | null {
     const s = nodeMap[e.from]; const t = nodeMap[e.to]
@@ -220,9 +244,13 @@ export function GraphSVG({
         const sign  = e.sign ?? 'neutral'
         const color = edgeColor(sign)
         const sw    = edgeWidth(e.strength)
-        const lpos  = e.label ? edgeLabelPos(e) : null
+        const lpos      = e.label ? edgeLabelPos(e) : null
         const labelText = e.label ?? ''
-        const labelW = labelText.length * 5
+        const labelW    = labelText.length * 5
+        const lagTxt    = (!compact && e.lag_min)   ? fmtLag(e.lag_min)    : null
+        const decayTxt  = (!compact && e.decay_days != null) ? fmtDecay(e.decay_days) : null
+        const lagPos    = lagTxt   ? bezierPt(e, 0.1)  : null
+        const decayPos  = decayTxt ? bezierPt(e, 0.88) : null
         return (
           <g key={i}>
             <path d={edgePath(e)} fill="none"
@@ -231,13 +259,26 @@ export function GraphSVG({
               markerEnd={`url(#arrow-${sign})`} opacity={0.85} />
             {lpos && (
               <g>
-                {/* Dark bg pill behind label */}
                 <rect x={lpos.x - 2} y={lpos.y - 9} width={labelW + 4} height={11}
                   rx={3} fill="#0c1220" opacity={0.82} />
                 <text x={lpos.x} y={lpos.y} fill={color} fontSize={8.5} fontWeight="500"
                   letterSpacing="0.2">{labelText}</text>
               </g>
             )}
+            {lagPos && lagTxt && (
+              <g>
+                <rect x={lagPos.x - 2} y={lagPos.y - 9} width={lagTxt.length * 5 + 4} height={11}
+                  rx={3} fill="#0c1220" opacity={0.85} />
+                <text x={lagPos.x} y={lagPos.y} fill="#fbbf24" fontSize={8} fontWeight="600">{lagTxt}</text>
+              </g>
+            )}
+            {decayPos && decayTxt && (
+              <g>
+                <rect x={decayPos.x - 2} y={decayPos.y - 9} width={decayTxt.length * 5 + 4} height={11}
+                  rx={3} fill="#0c1220" opacity={0.85} />
+                <text x={decayPos.x} y={decayPos.y} fill="#94a3b8" fontSize={8} fontWeight="600">{decayTxt}</text>
+              </g>
+            )}
           </g>
         )
       })}
@@ -335,9 +376,11 @@ function TabLibrary() {
   const [templates, setTemplates] = useState<Template[]>([])
   const [selected, setSelected]   = useState<Template | null>(null)
   const [catFilter, setCatFilter] = useState('')
-  const [saving, setSaving]       = useState(false)
-  const [deleting, setDeleting]   = useState(false)
-  const [editCoefs, setEditCoefs] = useState<Record<string, number>>({})
+  const [saving, setSaving]         = useState(false)
+  const [deleting, setDeleting]     = useState(false)
+  const [savingLag, setSavingLag]   = useState(false)
+  const [editCoefs, setEditCoefs]   = useState<Record<string, number>>({})
+  const [editEdgesLag, setEdgesLag] = useState<CausalEdge[]>([])
   const [loading, setLoading]     = useState(true)
   const [apiError, setApiError]   = useState<string | null>(null)
   const [debugInfo, setDebugInfo] = useState<Record<string, unknown> | null>(null)
@@ -358,6 +401,7 @@ function TabLibrary() {
     setEditCoefs(Object.fromEntries(
       Object.entries(t.graph_json?.coefficients || {}).map(([k, v]) => [k, v.value])
     ))
+    setEdgesLag(JSON.parse(JSON.stringify(t.graph_json?.edges || [])))
   }
 
   async function saveCoefs() {
@@ -373,6 +417,29 @@ function TabLibrary() {
     } finally { setSaving(false) }
   }
 
+  async function saveTemporalParams() {
+    if (!selected) return
+    setSavingLag(true)
+    try {
+      const updatedGraph = { ...selected.graph_json, edges: editEdgesLag }
+      await api(`/api/causal-lab/template/${selected.id}`, {
+        method: 'PATCH', headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ graph_json: updatedGraph }),
+      })
+      const fresh = await api(`/api/causal-lab/template/${selected.id}`)
+      setSelected(fresh)
+      setEdgesLag(JSON.parse(JSON.stringify(fresh.graph_json?.edges || [])))
+    } finally { setSavingLag(false) }
+  }
+
+  function updateEdgeLag(i: number, field: 'lag_min' | 'diffusion_min' | 'decay_days', val: string) {
+    setEdgesLag(prev => prev.map((e, idx) => idx !== i ? e : {
+      ...e,
+      [field]: val === '' ? (field === 'decay_days' ? null : undefined)
+                          : (field === 'decay_days' ? parseFloat(val) : parseInt(val)),
+    }))
+  }
+
   async function deleteTemplate() {
     if (!selected) return
     if (!window.confirm(`Supprimer "${selected.name}" ? Cette action est irréversible.`)) return
@@ -498,6 +565,45 @@ function TabLibrary() {
               {saving ? 'Sauvegarde…' : 'Sauvegarder les coefficients'}
             </button>
           </div>
+
+          {/* Paramètres temporels */}
+          {editEdgesLag.some(e => e.from && e.to) && (
+            <div className="bg-dark-700 rounded-lg p-4 border border-slate-700/40">
+              <h4 className="text-slate-300 text-xs font-semibold mb-3 uppercase tracking-wider flex items-center gap-2">
+                <Zap className="w-3.5 h-3.5 text-yellow-400" /> Paramètres temporels
+              </h4>
+              <div className="space-y-2">
+                <div className="grid grid-cols-[1fr_64px_64px_64px] gap-2 text-xs text-slate-500 pb-1 border-b border-slate-700/30">
+                  <span>Arête</span><span className="text-center">Lag (m)</span>
+                  <span className="text-center">Diff. (m)</span><span className="text-center">Decay (j)</span>
+                </div>
+                {editEdgesLag.map((e, i) => (
+                  <div key={i} className="grid grid-cols-[1fr_64px_64px_64px] gap-2 items-center">
+                    <span className="text-xs font-mono text-slate-400 truncate">{e.from} → {e.to}</span>
+                    <input type="number" min={0} step={5}
+                      value={e.lag_min ?? ''}
+                      onChange={ev => updateEdgeLag(i, 'lag_min', ev.target.value)}
+                      placeholder="0"
+                      className="w-full bg-dark-800 border border-slate-600 rounded px-1.5 py-1 text-xs text-slate-200 text-center" />
+                    <input type="number" min={0} step={15}
+                      value={e.diffusion_min ?? ''}
+                      onChange={ev => updateEdgeLag(i, 'diffusion_min', ev.target.value)}
+                      placeholder="60"
+                      className="w-full bg-dark-800 border border-slate-600 rounded px-1.5 py-1 text-xs text-slate-200 text-center" />
+                    <input type="number" min={0} step={1}
+                      value={e.decay_days ?? ''}
+                      onChange={ev => updateEdgeLag(i, 'decay_days', ev.target.value)}
+                      placeholder="∞"
+                      className="w-full bg-dark-800 border border-slate-600 rounded px-1.5 py-1 text-xs text-slate-200 text-center" />
+                  </div>
+                ))}
+              </div>
+              <button onClick={saveTemporalParams} disabled={savingLag}
+                className="mt-4 px-4 py-2 bg-yellow-700 hover:bg-yellow-600 disabled:opacity-50 rounded text-xs font-medium text-white">
+                {savingLag ? 'Sauvegarde…' : 'Sauvegarder les paramètres temporels'}
+              </button>
+            </div>
+          )}
         </div>
       ) : (
         <div className="flex-1 flex items-center justify-center text-slate-600 text-sm">
@@ -1003,6 +1109,29 @@ function TabEditor() {
                   value={newEdge.label ?? ''} onChange={e => setNewEdge(p => ({ ...p, label: e.target.value }))}
                   className="w-full bg-dark-700 border border-slate-600 rounded px-1.5 py-1 text-slate-200 text-xs mt-0.5" />
               </div>
+              <div className="grid grid-cols-3 gap-1">
+                <div>
+                  <label className="text-slate-500">Lag (min)</label>
+                  <input type="number" min={0} step={5} placeholder="0"
+                    value={newEdge.lag_min ?? ''}
+                    onChange={e => setNewEdge(p => ({ ...p, lag_min: e.target.value === '' ? undefined : parseInt(e.target.value) }))}
+                    className="w-full bg-dark-700 border border-slate-600 rounded px-1.5 py-1 text-slate-200 text-xs mt-0.5" />
+                </div>
+                <div>
+                  <label className="text-slate-500">Diffusion (min)</label>
+                  <input type="number" min={0} step={15} placeholder="60"
+                    value={newEdge.diffusion_min ?? ''}
+                    onChange={e => setNewEdge(p => ({ ...p, diffusion_min: e.target.value === '' ? undefined : parseInt(e.target.value) }))}
+                    className="w-full bg-dark-700 border border-slate-600 rounded px-1.5 py-1 text-slate-200 text-xs mt-0.5" />
+                </div>
+                <div>
+                  <label className="text-slate-500">Decay (jours)</label>
+                  <input type="number" min={0} step={1} placeholder="∞"
+                    value={newEdge.decay_days ?? ''}
+                    onChange={e => setNewEdge(p => ({ ...p, decay_days: e.target.value === '' ? null : parseFloat(e.target.value) }))}
+                    className="w-full bg-dark-700 border border-slate-600 rounded px-1.5 py-1 text-slate-200 text-xs mt-0.5" />
+                </div>
+              </div>
               <button onClick={addEdge}
                 className="w-full py-1 bg-purple-600 hover:bg-purple-500 rounded text-xs text-white">
                 + Ajouter l'arête
@@ -1068,6 +1197,29 @@ function TabEditor() {
                         onChange={ev => setEditEdgeVal(p => ({ ...p, label: ev.target.value }))}
                         className="w-full bg-dark-700 border border-slate-600 rounded px-1.5 py-1 text-slate-200 text-xs mt-0.5" />
                     </div>
+                    <div className="grid grid-cols-3 gap-1">
+                      <div>
+                        <label className="text-slate-500">Lag (min)</label>
+                        <input type="number" min={0} step={5}
+                          value={editEdge.lag_min ?? e.lag_min ?? ''}
+                          onChange={ev => setEditEdgeVal(p => ({ ...p, lag_min: ev.target.value === '' ? undefined : parseInt(ev.target.value) }))}
+                          className="w-full bg-dark-700 border border-slate-600 rounded px-1.5 py-1 text-slate-200 text-xs mt-0.5" />
+                      </div>
+                      <div>
+                        <label className="text-slate-500">Diffusion (min)</label>
+                        <input type="number" min={0} step={15}
+                          value={editEdge.diffusion_min ?? e.diffusion_min ?? ''}
+                          onChange={ev => setEditEdgeVal(p => ({ ...p, diffusion_min: ev.target.value === '' ? undefined : parseInt(ev.target.value) }))}
+                          className="w-full bg-dark-700 border border-slate-600 rounded px-1.5 py-1 text-slate-200 text-xs mt-0.5" />
+                      </div>
+                      <div>
+                        <label className="text-slate-500">Decay (j)</label>
+                        <input type="number" min={0} step={1}
+                          value={editEdge.decay_days ?? e.decay_days ?? ''}
+                          onChange={ev => setEditEdgeVal(p => ({ ...p, decay_days: ev.target.value === '' ? null : parseFloat(ev.target.value) }))}
+                          className="w-full bg-dark-700 border border-slate-600 rounded px-1.5 py-1 text-slate-200 text-xs mt-0.5" />
+                      </div>
+                    </div>
                     <button onClick={applyEdgeEdit}
                       className="w-full py-1 bg-yellow-700 hover:bg-yellow-600 rounded text-xs text-white">
                       Appliquer
@@ -1388,6 +1540,7 @@ function TabAnalyze() {
                   { label: 'Réel post', val: fmtPips(result.drift?.post_pips) },
                   { label: 'Mode prix', val: result.prices_mode },
                   { label: 'Fuite info', val: result.drift?.leak ?? '—' },
+                  { label: 'Lag mesuré', val: result.effective_lag_min != null ? `${result.effective_lag_min}min` : '0min' },
                 ].map(m => (
                   <div key={m.label} className="bg-dark-800 rounded p-3 text-center">
                     <div className="text-xs text-slate-500">{m.label}</div>