diff --git a/frontend/src/components/VttEditor/VttEditor.tsx b/frontend/src/components/VttEditor/VttEditor.tsx
index 18445bf..7ee6a53 100644
--- a/frontend/src/components/VttEditor/VttEditor.tsx
+++ b/frontend/src/components/VttEditor/VttEditor.tsx
@@ -1,5 +1,48 @@
 import { useState, useEffect, useRef } from 'react';
 import { VTTParser, VTTValidator, type VTTCue } from '../../lib/vtt';
+import type { GlossaryTerm } from '../../types/api';
+
+const CPS_THRESHOLD = 20;
+
+function computeCps(cue: VTTCue): number {
+  const chars = cue.text.replace(/[\n\r]/g, ' ').trim().length;
+  const duration = cue.endTime - cue.startTime;
+  if (duration <= 0) return 0;
+  return chars / duration;
+}
+
+type TextSegment = { text: string; glossaryMatch?: { preferred: string; notes?: string } };
+
+function buildSegments(text: string, glossaryTerms: GlossaryTerm[], language: string): TextSegment[] {
+  if (!glossaryTerms.length) return [{ text }];
+
+  // Build a combined regex from all source terms
+  const patterns = glossaryTerms
+    .filter(t => t.translations[language])
+    .map(t => ({ pattern: t.source_term.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), term: t }));
+  if (!patterns.length) return [{ text }];
+
+  const regex = new RegExp(`(${patterns.map(p => p.pattern).join('|')})`, 'gi');
+  const parts = text.split(regex);
+  const segments: TextSegment[] = [];
+
+  for (const part of parts) {
+    if (!part) continue;
+    const matchedTerm = patterns.find(p => new RegExp(`^${p.pattern}$`, 'i').test(part));
+    if (matchedTerm) {
+      segments.push({
+        text: part,
+        glossaryMatch: {
+          preferred: matchedTerm.term.translations[language] || '',
+          notes: undefined,
+        },
+      });
+    } else {
+      segments.push({ text: part });
+    }
+  }
+  return segments;
+}
 
 // Pure function for validating a single cue's timing (no hooks dependency)
 function validateCueTimingAtIndex(allCues: VTTCue[], index: number): string[] {
@@ -44,9 +87,11 @@ interface VttEditorProps {
   onCueDeleted?: (deletedIndex: number, totalCuesAfterDelete: number) => void;
   title: string;
   readOnly?: boolean;
+  glossaryTerms?: GlossaryTerm[];
+  language?: string;
 }
 
-export function VttEditor({ vttContent, onChange, onCueSave, onCueInserted, onCueDeleted, title, readOnly = false }: VttEditorProps) {
+export function VttEditor({ vttContent, onChange, onCueSave, onCueInserted, onCueDeleted, title, readOnly = false, glossaryTerms = [], language = 'en' }: VttEditorProps) {
   const [cues, setCues] = useState<VTTCue[]>([]);
   const [errors, setErrors] = useState<string[]>([]);
   const [editingCue, setEditingCue] = useState<number | null>(null);
@@ -310,6 +355,18 @@ export function VttEditor({ vttContent, onChange, onCueSave, onCueInserted, onCu
                   </div>
                 )}
 
+                {/* CPS badge */}
+                {(() => {
+                  const cps = computeCps(cue);
+                  return cps > CPS_THRESHOLD ? (
+                    <div className="mb-1 flex items-center gap-1">
+                      <span className="text-xs px-1.5 py-0.5 bg-amber-100 text-amber-700 rounded font-medium" title={`${cps.toFixed(1)} characters per second — above the ${CPS_THRESHOLD} CPS recommended limit`}>
+                        ⚡ {cps.toFixed(0)} CPS
+                      </span>
+                    </div>
+                  ) : null;
+                })()}
+
                 {/* Text Content */}
                 {editingCue === index ? (
                   <CueEditor
@@ -320,7 +377,19 @@ export function VttEditor({ vttContent, onChange, onCueSave, onCueInserted, onCu
                 ) : (
                   <div className="group">
                     <div className="text-gray-900 whitespace-pre-wrap leading-relaxed">
-                      {cue.text}
+                      {buildSegments(cue.text, glossaryTerms, language).map((seg, si) =>
+                        seg.glossaryMatch ? (
+                          <span
+                            key={si}
+                            className="underline decoration-amber-400 decoration-2 underline-offset-2 cursor-help"
+                            title={`Preferred: ${seg.glossaryMatch.preferred}`}
+                          >
+                            {seg.text}
+                          </span>
+                        ) : (
+                          <span key={si}>{seg.text}</span>
+                        )
+                      )}
                     </div>
                     {!readOnly && (
                       <button
diff --git a/frontend/src/routes/admin/QCDetail.tsx b/frontend/src/routes/admin/QCDetail.tsx
index ddcd493..7d0eb77 100644
--- a/frontend/src/routes/admin/QCDetail.tsx
+++ b/frontend/src/routes/admin/QCDetail.tsx
@@ -109,6 +109,23 @@ export function QCDetail() {
   });
   const langQcMap = langQcData?.language_qc ?? {};
 
+  // Glossary terms for inline highlighting
+  const clientId = job?.client_id;
+  const { data: glossariesData } = useQuery({
+    queryKey: ['client-glossaries', clientId],
+    queryFn: () => apiClient.getGlossaries(clientId!),
+    enabled: !!clientId,
+    staleTime: 60_000,
+  });
+  const activeGlossaryId = glossariesData?.find(g => g.current_version_id)?.id;
+  const { data: glossaryTermsData } = useQuery({
+    queryKey: ['glossary-terms', clientId, activeGlossaryId],
+    queryFn: () => apiClient.getGlossaryTerms(clientId!, activeGlossaryId!, { pageSize: 500 }),
+    enabled: !!clientId && !!activeGlossaryId,
+    staleTime: 120_000,
+  });
+  const glossaryTerms = glossaryTermsData?.terms ?? [];
+
   const [showLangRejectModal, setShowLangRejectModal] = useState(false);
   const [langRejectNotes, setLangRejectNotes] = useState('');
   const [langRejectCategory, setLangRejectCategory] = useState('');
@@ -1551,6 +1568,8 @@ export function QCDetail() {
                 onCueSave={handleCaptionsCueSave}
                 title={`Closed Captions (${selectedLanguage.toUpperCase()})`}
                 readOnly={isProcessing}
+                glossaryTerms={glossaryTerms}
+                language={selectedLanguage}
               />
             </div>
           )}
@@ -1576,6 +1595,8 @@ export function QCDetail() {
                 onCueDeleted={handleAdCueDeleted}
                 title={`Audio Description (${selectedLanguage.toUpperCase()})`}
                 readOnly={isProcessing}
+                glossaryTerms={glossaryTerms}
+                language={selectedLanguage}
               />
             </div>
           )}