diff --git a/scripts/fba-core-regression-test-env.mjs b/scripts/fba-core-regression-test-env.mjs
index 1f6229a6f..621416ae0 100644
--- a/scripts/fba-core-regression-test-env.mjs
+++ b/scripts/fba-core-regression-test-env.mjs
@@ -68,12 +68,17 @@ export function validateCoreEnvironment(env,root=repositoryRoot) {
   return base.origin
 }
 export function redactEvidence(value,secrets=[]) {
-  if(Array.isArray(value))return value.map(item=>redactEvidence(item,secrets))
-  if(value&&typeof value==='object')return Object.fromEntries(Object.entries(value).map(([key,item])=>[key,
-    /^(?:.*password|.*token|authorization|cookie|gateway|jenkinsUrl|privateKey)$/i.test(key)?'[REDACTED]':redactEvidence(item,secrets)]))
-  if(typeof value==='string')return secrets.filter(secret=>typeof secret==='string'&&secret.length>0)
-    .reduce((text,secret)=>text.split(secret).join('[REDACTED]'),value)
-  return value
+  // Long runs can register the same credential repeatedly. Normalize once per
+  // report, rather than filtering and reapplying it for every nested string.
+  const uniqueSecrets=[...new Set(secrets)].filter(secret=>typeof secret==='string'&&secret.length>0)
+  function redact(item) {
+    if(Array.isArray(item))return item.map(redact)
+    if(item&&typeof item==='object')return Object.fromEntries(Object.entries(item).map(([key,child])=>[key,
+      /^(?:.*password|.*token|authorization|cookie|gateway|jenkinsUrl|privateKey)$/i.test(key)?'[REDACTED]':redact(child)]))
+    if(typeof item==='string')return uniqueSecrets.reduce((text,secret)=>text.split(secret).join('[REDACTED]'),item)
+    return item
+  }
+  return redact(value)
 }
 export function modePassed(report) {
   const proof=report?.createdResources?.phase5RootFulfillment
diff --git a/scripts/fba-core-regression-test-env.test.mjs b/scripts/fba-core-regression-test-env.test.mjs
index ace7bca1d..3e8d11926 100644
--- a/scripts/fba-core-regression-test-env.test.mjs
+++ b/scripts/fba-core-regression-test-env.test.mjs
@@ -124,6 +124,17 @@ test('preflight failure creates summary but no HTTP fixture; existing run or act
   await assert.rejects(runFbaCore({...config(),runId:'next',outputDir:'reports/next'},{env:env(),outputRoot,readers:readers()}))
   assert.equal(readFileSync(lock,'utf8'),'occupied')
 })
+test('redaction scans the secret input once for the complete report tree',()=>{
+  let reads=0
+  const values=Array.from({length:80},()=> 'synthetic-private-value')
+  const secrets=new Proxy(values,{get(target,key,receiver){if(/^\d+$/.test(String(key)))reads++;return Reflect.get(target,key,receiver)}})
+  const report={steps:Array.from({length:40},()=>({message:'prefix synthetic-private-value suffix',nested:{token:'hidden',public:'kept'}}))}
+  const result=redactEvidence(report,secrets)
+  assert.ok(result.steps.every(row=>row.message==='prefix [REDACTED] suffix'&&row.nested.token==='[REDACTED]'&&row.nested.public==='kept'))
+  assert.equal(reads,values.length,'normalization must not repeat for every evidence string')
+  assert.equal(report.steps[0].message,'prefix synthetic-private-value suffix','input report is not modified')
+})
+
 test('reports redact dynamically created account secrets and environment/token values',()=>{
   const value=redactEvidence({password:'x',pdaToken:'y',message:'failure private-secret',nested:{gateway:'url',value:'safe'}},['private-secret'])
   assert.equal(value.password,'[REDACTED]');assert.equal(value.pdaToken,'[REDACTED]')