diff --git a/explorer/src/workspaces/GraphWorkspace/GraphWorkspace.tsx b/explorer/src/workspaces/GraphWorkspace/GraphWorkspace.tsx
index 9e3e5cab..f055a3a3 100644
--- a/explorer/src/workspaces/GraphWorkspace/GraphWorkspace.tsx
+++ b/explorer/src/workspaces/GraphWorkspace/GraphWorkspace.tsx
@@ -2351,16 +2351,15 @@ export function GraphWorkspace({ externalFocusNodeId, externalFocusToken }: Grap
     showPluginDock: openDockPanels.length > 0,
   };
 
-  useEffect(() => {
+  const [prevOpenDockPanels, setPrevOpenDockPanels] = useState(openDockPanels);
+  if (openDockPanels !== prevOpenDockPanels) {
+    setPrevOpenDockPanels(openDockPanels);
     if (!openDockPanels.length) {
-      setActiveDockPanelId(null);
-      return;
-    }
-
-    if (!activeDockPanelId || !openDockPanels.some((panel) => panel.id === activeDockPanelId)) {
+      if (activeDockPanelId !== null) setActiveDockPanelId(null);
+    } else if (!activeDockPanelId || !openDockPanels.some((panel) => panel.id === activeDockPanelId)) {
       setActiveDockPanelId(openDockPanels[0].id);
     }
-  }, [activeDockPanelId, openDockPanels]);
+  }
 
   const viewModeItems = useMemo<GraphToolbarItem[]>(() => {
     if (!hasGraphContent) {
diff --git a/explorer/src/workspaces/GraphWorkspace/GraphWorkspaceShell.tsx b/explorer/src/workspaces/GraphWorkspace/GraphWorkspaceShell.tsx
index 1407bedc..440c3e33 100644
--- a/explorer/src/workspaces/GraphWorkspace/GraphWorkspaceShell.tsx
+++ b/explorer/src/workspaces/GraphWorkspace/GraphWorkspaceShell.tsx
@@ -369,7 +369,9 @@ export function GraphWorkspaceShell() {
     }
   }, []);
 
-  useEffect(() => {
+  const [prevFetchedAt, setPrevFetchedAt] = useState(snapshot?.fetchedAt);
+  if (snapshot?.fetchedAt !== prevFetchedAt) {
+    setPrevFetchedAt(snapshot?.fetchedAt);
     if (snapshot) {
       setIsGraphStageReady(false);
       setActiveNodeCount(null);
@@ -383,7 +385,7 @@ export function GraphWorkspaceShell() {
         stableSamples: 0,
       });
     }
-  }, [snapshot?.fetchedAt]);
+  }
 
   useEffect(() => {
     let cancelled = false;
diff --git a/explorer/src/workspaces/LineageWorkspace/LineageDiagram.tsx b/explorer/src/workspaces/LineageWorkspace/LineageDiagram.tsx
index bd53cc14..edc138d2 100644
--- a/explorer/src/workspaces/LineageWorkspace/LineageDiagram.tsx
+++ b/explorer/src/workspaces/LineageWorkspace/LineageDiagram.tsx
@@ -51,12 +51,18 @@ export function LineageDiagram() {
     document.body.removeChild(anchor);
   };
 
-  useEffect(() => {
+  const [prevActiveId, setPrevActiveId] = useState(activeId);
+  if (activeId !== prevActiveId) {
+    setPrevActiveId(activeId);
     if (!activeId) {
       setNodes([]);
       setEdges([]);
-      return;
     }
+  }
+
+  useEffect(() => {
+    let ignore = false;
+    if (!activeId) return;
 
     const xLanes = [
       { id: "group_agent", type: "group", position: { x: 50, y: 50 }, style: { width: 800, height: 120 } },
@@ -89,7 +95,7 @@ export function LineageDiagram() {
           counters[n.parent_id] = c + 1;
           return {
             id: n.id,
-            data: { label: n.label + "\\n(" + n.prov_type + ")" },
+            data: { label: n.label + "\n(" + n.prov_type + ")" },
             position: { x: 50 + c * 180, y: 30 },
             parentId: n.parent_id,
             extent: "parent",
@@ -106,13 +112,16 @@ export function LineageDiagram() {
           style: { stroke: "#58a6ff" }
         }));
 
-        setNodes([...xLanes, ...mappedNodes]);
-        setEdges(mappedEdges);
+        if (!ignore) {
+          setNodes([...xLanes, ...mappedNodes]);
+          setEdges(mappedEdges);
+        }
       } catch (err) {
         console.error(err);
       }
     };
-    fetchLineage();
+    void fetchLineage();
+    return () => { ignore = true; };
   }, [activeId]);
 
   return (
diff --git a/explorer/src/workspaces/ManageWorkspace/KGOverviewTab.tsx b/explorer/src/workspaces/ManageWorkspace/KGOverviewTab.tsx
index e882ba91..85a0a422 100644
--- a/explorer/src/workspaces/ManageWorkspace/KGOverviewTab.tsx
+++ b/explorer/src/workspaces/ManageWorkspace/KGOverviewTab.tsx
@@ -116,8 +116,51 @@ export function KGOverviewTab() {
   }, []);
 
   useEffect(() => {
-    void fetchOverview();
-  }, [fetchOverview]);
+    let ignore = false;
+    async function fetchInitial() {
+      try {
+        const [statsRes, nodesRes] = await Promise.all([
+          fetch("/api/graph/stats"),
+          fetch("/api/graph/nodes?limit=500"),
+        ]);
+
+        if (!ignore) {
+          if (statsRes.ok) {
+            const statsData: KGStats = await statsRes.json();
+            setStats(statsData);
+          }
+
+          if (nodesRes.ok) {
+            const nodesData: NodeListResponse = await nodesRes.json();
+            const nodes = nodesData.nodes ?? [];
+            setNodeTypeMap(buildTypeMap(nodes, "type"));
+
+            const edgesRes = await fetch("/api/graph/edges?limit=2000");
+            if (edgesRes.ok) {
+              const edgesData = await edgesRes.json();
+              const edges: { source: string; target: string }[] = edgesData.edges ?? [];
+              const degreeMap: Record<string, number> = {};
+              for (const edge of edges) {
+                degreeMap[edge.source] = (degreeMap[edge.source] ?? 0) + 1;
+                degreeMap[edge.target] = (degreeMap[edge.target] ?? 0) + 1;
+              }
+              const sorted = nodes
+                .map((n) => ({ node: n, neighborCount: degreeMap[n.id] ?? 0 }))
+                .sort((a, b) => b.neighborCount - a.neighborCount)
+                .slice(0, 10);
+              setTopNodes(sorted);
+            }
+          }
+        }
+      } catch {
+        if (!ignore) setError("Failed to load graph overview. Ensure the server is running.");
+      } finally {
+        if (!ignore) setLoading(false);
+      }
+    }
+    void fetchInitial();
+    return () => { ignore = true; };
+  }, []);
 
   const nodeTypeEntries = Object.entries(nodeTypeMap).sort((a, b) => b[1] - a[1]);
   const edgeTypeEntries = stats?.edge_types
diff --git a/explorer/src/workspaces/OntologyWorkspace/AlignmentsTab.tsx b/explorer/src/workspaces/OntologyWorkspace/AlignmentsTab.tsx
index 8034705d..67f4024f 100644
--- a/explorer/src/workspaces/OntologyWorkspace/AlignmentsTab.tsx
+++ b/explorer/src/workspaces/OntologyWorkspace/AlignmentsTab.tsx
@@ -66,8 +66,27 @@ export function AlignmentsTab() {
   }, []);
 
   useEffect(() => {
-    void reload();
-  }, [reload]);
+    let ignore = false;
+    async function fetchInitial() {
+      const [registryResult, alignmentResult] = await Promise.allSettled([
+        loadOntologyRegistry(),
+        loadAlignments(),
+      ]);
+
+      if (!ignore) {
+        if (registryResult.status === "fulfilled") {
+          setRegistry(registryResult.value);
+          setSourceOntology((current) => current || registryResult.value[0]?.uri || "");
+          setTargetOntology((current) => current || registryResult.value[1]?.uri || registryResult.value[0]?.uri || "");
+        }
+        if (alignmentResult.status === "fulfilled") {
+          setAlignments(alignmentResult.value);
+        }
+      }
+    }
+    void fetchInitial();
+    return () => { ignore = true; };
+  }, []);
 
   const relationCounts = useMemo(() => {
     const counts = new Map<string, number>();
diff --git a/explorer/src/workspaces/OntologyWorkspace/HealthTab.tsx b/explorer/src/workspaces/OntologyWorkspace/HealthTab.tsx
index 44d2ffed..87640db6 100644
--- a/explorer/src/workspaces/OntologyWorkspace/HealthTab.tsx
+++ b/explorer/src/workspaces/OntologyWorkspace/HealthTab.tsx
@@ -29,23 +29,31 @@ export function HealthTab({ onFixInEditor }: HealthTabProps) {
     };
   }, []);
 
-  const loadHealth = useCallback(async (uri: string) => {
-    if (!uri) return;
-    setLoading(true);
-    setError("");
-    try {
-      setHealth(await loadOntologyHealth(uri));
-    } catch {
-      // Backend unavailable — show "select an ontology" placeholder, not an error
-      setHealth(null);
-    } finally {
-      setLoading(false);
+  const [prevUri, setPrevUri] = useState(selectedUri);
+  if (selectedUri !== prevUri) {
+    setPrevUri(selectedUri);
+    if (selectedUri) {
+      setLoading(true);
+      setError("");
     }
-  }, []);
+  }
 
   useEffect(() => {
-    void loadHealth(selectedUri);
-  }, [selectedUri, loadHealth]);
+    let ignore = false;
+    async function fetchHealth() {
+      if (!selectedUri) return;
+      try {
+        const data = await loadOntologyHealth(selectedUri);
+        if (!ignore) setHealth(data);
+      } catch {
+        if (!ignore) setHealth(null);
+      } finally {
+        if (!ignore) setLoading(false);
+      }
+    }
+    void fetchHealth();
+    return () => { ignore = true; };
+  }, [selectedUri]);
 
   const exportReport = useCallback(() => {
     if (!health) return;
diff --git a/explorer/src/workspaces/OntologyWorkspace/OntologyManager.tsx b/explorer/src/workspaces/OntologyWorkspace/OntologyManager.tsx
index 363de1bc..71c98961 100644
--- a/explorer/src/workspaces/OntologyWorkspace/OntologyManager.tsx
+++ b/explorer/src/workspaces/OntologyWorkspace/OntologyManager.tsx
@@ -248,6 +248,15 @@ export function OntologyManager() {
   const [rightPanel, setRightPanel] = useState<RightPanel>("none");
   const [actionMsg, setActionMsg] = useState<{ type: "ok" | "err"; text: string } | null>(null);
 
+  const [prevSearchQ, setPrevSearchQ] = useState(searchQ);
+  const [prevStatusFilter, setPrevStatusFilter] = useState(statusFilter);
+  if (searchQ !== prevSearchQ || statusFilter !== prevStatusFilter) {
+    setPrevSearchQ(searchQ);
+    setPrevStatusFilter(statusFilter);
+    setLoading(true);
+    setActionMsg(null);
+  }
+
   const fetchRegistry = useCallback(async () => {
     setLoading(true);
     setActionMsg(null);
@@ -268,8 +277,27 @@ export function OntologyManager() {
   }, [searchQ, statusFilter]);
 
   useEffect(() => {
-    fetchRegistry();
-  }, [fetchRegistry]);
+    let ignore = false;
+    async function fetchInitial() {
+      try {
+        const params = new URLSearchParams();
+        if (searchQ) params.set("q", searchQ);
+        const res = await fetch(`/api/ontology/registry?${params}`);
+        if (res.ok) {
+          const data = await res.json();
+          if (!ignore) setEntries(data);
+        } else {
+          if (!ignore) setEntries([]);
+        }
+      } catch {
+        if (!ignore) setEntries([]);
+      } finally {
+        if (!ignore) setLoading(false);
+      }
+    }
+    void fetchInitial();
+    return () => { ignore = true; };
+  }, [searchQ, statusFilter]);
 
   const flashMsg = (type: "ok" | "err", text: string) => {
     setActionMsg({ type, text });
diff --git a/explorer/src/workspaces/OntologyWorkspace/OntologySearch.tsx b/explorer/src/workspaces/OntologyWorkspace/OntologySearch.tsx
index 5285aad4..37094013 100644
--- a/explorer/src/workspaces/OntologyWorkspace/OntologySearch.tsx
+++ b/explorer/src/workspaces/OntologyWorkspace/OntologySearch.tsx
@@ -178,17 +178,31 @@ function DetailPanel({
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState("");
 
-  useEffect(() => {
+  const [prevUri, setPrevUri] = useState(uri);
+  if (uri !== prevUri) {
+    setPrevUri(uri);
     setLoading(true);
     setError("");
+    setDetail(null);
+  }
+
+  useEffect(() => {
+    let ignore = false;
     fetch(`/api/ontology/entity/${encodeURIComponent(uri)}`)
       .then((r) => {
         if (!r.ok) throw new Error("Not found");
         return r.json();
       })
-      .then(setDetail)
-      .catch((e) => setError(e.message))
-      .finally(() => setLoading(false));
+      .then((data) => {
+        if (!ignore) setDetail(data);
+      })
+      .catch((e) => {
+        if (!ignore) setError(e.message);
+      })
+      .finally(() => {
+        if (!ignore) setLoading(false);
+      });
+    return () => { ignore = true; };
   }, [uri]);
 
   return (
diff --git a/explorer/src/workspaces/OntologyWorkspace/ProposalReview.tsx b/explorer/src/workspaces/OntologyWorkspace/ProposalReview.tsx
index 226778a3..030987a9 100644
--- a/explorer/src/workspaces/OntologyWorkspace/ProposalReview.tsx
+++ b/explorer/src/workspaces/OntologyWorkspace/ProposalReview.tsx
@@ -40,19 +40,6 @@ export function ProposalReview({ proposalId }: { proposalId: string }) {
   const [selectedElement, setSelectedElement] = useState<string | null>(null);
   const [commentText, setCommentText] = useState("");
 
-  const loadProposal = useCallback(async () => {
-    try {
-      const response = await fetch(`/api/ontology/proposals/${proposalId}`);
-      if (response.ok) {
-        const data = await response.json();
-        setProposal(data);
-        generateDiff(data);
-      }
-    } catch (error) {
-      console.error("Failed to load proposal:", error);
-    }
-  }, [proposalId]);
-
   const generateDiff = useCallback((prop: Proposal) => {
     const changes: DiffChange[] = [];
 
@@ -75,9 +62,38 @@ export function ProposalReview({ proposalId }: { proposalId: string }) {
     setDiff(changes);
   }, []);
 
+  const loadProposal = useCallback(async () => {
+    try {
+      const response = await fetch(`/api/ontology/proposals/${proposalId}`);
+      if (response.ok) {
+        const data = await response.json();
+        setProposal(data);
+        generateDiff(data);
+      }
+    } catch (error) {
+      console.error("Failed to load proposal:", error);
+    }
+  }, [proposalId, generateDiff]);
+
   useEffect(() => {
-    loadProposal();
-  }, [loadProposal]);
+    let ignore = false;
+    async function fetchInitial() {
+      try {
+        const response = await fetch(`/api/ontology/proposals/${proposalId}`);
+        if (response.ok) {
+          const data = await response.json();
+          if (!ignore) {
+            setProposal(data);
+            generateDiff(data);
+          }
+        }
+      } catch (error) {
+        console.error("Failed to load proposal:", error);
+      }
+    }
+    void fetchInitial();
+    return () => { ignore = true; };
+  }, [proposalId, generateDiff]);
 
   const addComment = useCallback(async () => {
     if (!selectedElement || !commentText || !proposal) return;
diff --git a/explorer/src/workspaces/OntologyWorkspace/SKOSVocabularyManager.tsx b/explorer/src/workspaces/OntologyWorkspace/SKOSVocabularyManager.tsx
index d46951d5..d9284e64 100644
--- a/explorer/src/workspaces/OntologyWorkspace/SKOSVocabularyManager.tsx
+++ b/explorer/src/workspaces/OntologyWorkspace/SKOSVocabularyManager.tsx
@@ -77,17 +77,33 @@ function ConceptDetailPanel({
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState("");
 
-  useEffect(() => {
+  const [prevUri, setPrevUri] = useState(uri);
+  if (uri !== prevUri) {
+    setPrevUri(uri);
     setLoading(true);
     setError("");
+    setDetail(null);
+  }
+
+  useEffect(() => {
+    let ignore = false;
     fetch(`/api/ontology/skos/concept/${encodeURIComponent(uri)}`)
       .then((r) => {
         if (!r.ok) throw new Error("Concept not found");
         return r.json();
       })
-      .then(setDetail)
-      .catch((e) => setError(e.message))
-      .finally(() => setLoading(false));
+      .then((data) => {
+        if (!ignore) setDetail(data);
+      })
+      .catch((e) => {
+        if (!ignore) setError(e.message);
+      })
+      .finally(() => {
+        if (!ignore) setLoading(false);
+      });
+    return () => {
+      ignore = true;
+    };
   }, [uri]);
 
   const renderUriList = (label: string, uris: string[]) => {
@@ -322,16 +338,36 @@ function SchemePanel({
 }) {
   const [expanded, setExpanded] = useState(true);
   const [hierarchy, setHierarchy] = useState<ConceptNode[]>([]);
-  const [loading, setLoading] = useState(false);
+  const [loading, setLoading] = useState(expanded);
+
+  const [prevExpanded, setPrevExpanded] = useState(expanded);
+  const [prevSchemeUri, setPrevSchemeUri] = useState(scheme.uri);
+  if (expanded !== prevExpanded || scheme.uri !== prevSchemeUri) {
+    setPrevExpanded(expanded);
+    setPrevSchemeUri(scheme.uri);
+    if (expanded) {
+      setLoading(true);
+      setHierarchy([]);
+    }
+  }
 
   useEffect(() => {
+    let ignore = false;
     if (!expanded) return;
-    setLoading(true);
     fetch(`/api/vocabulary/hierarchy?scheme=${encodeURIComponent(scheme.uri)}`)
       .then((r) => (r.ok ? r.json() : []))
-      .then(setHierarchy)
-      .catch(() => setHierarchy([]))
-      .finally(() => setLoading(false));
+      .then((data) => {
+        if (!ignore) setHierarchy(data);
+      })
+      .catch(() => {
+        if (!ignore) setHierarchy([]);
+      })
+      .finally(() => {
+        if (!ignore) setLoading(false);
+      });
+    return () => {
+      ignore = true;
+    };
   }, [scheme.uri, expanded]);
 
   const totalConcepts = countConcepts(hierarchy);
@@ -410,7 +446,6 @@ export function SKOSVocabularyManager({ schemeUri }: Props) {
   const [selectedUri, setSelectedUri] = useState<string | null>(null);
 
   useEffect(() => {
-    setLoading(true);
     fetch("/api/ontology/skos/schemes")
       .then((r) => (r.ok ? r.json() : []))
       .then(setSchemes)
diff --git a/explorer/src/workspaces/OntologyWorkspace/ShaclStudio.tsx b/explorer/src/workspaces/OntologyWorkspace/ShaclStudio.tsx
index 5a64ee9b..50a44763 100644
--- a/explorer/src/workspaces/OntologyWorkspace/ShaclStudio.tsx
+++ b/explorer/src/workspaces/OntologyWorkspace/ShaclStudio.tsx
@@ -39,32 +39,42 @@ export function ShaclStudio({ onJumpToNode }: ShaclStudioProps) {
     };
   }, []);
 
-  const loadShapes = useCallback(async (uri: string) => {
-    if (!uri) return;
-    setLoading(true);
-    setError("");
-    try {
-      const data = await loadShaclShapes(uri);
-      setShapes(data.shapes);
-      const turtle = data.shacl_turtle;
-      setFullShacl(turtle);
-      setShacl((current) => current || turtle);
-      setSelectedShapeId(null);
-      setValidation(null);
-    } catch {
-      // Shapes not yet generated or backend unavailable — show empty shape list
-      setShapes([]);
-    } finally {
-      setLoading(false);
-    }
-  }, []);
-
-  useEffect(() => {
+  const [prevUri, setPrevUri] = useState(selectedUri);
+  if (selectedUri !== prevUri) {
+    setPrevUri(selectedUri);
     setShacl("");
     setFullShacl("");
     setSelectedShapeId(null);
-    void loadShapes(selectedUri);
-  }, [selectedUri, loadShapes]);
+    setValidation(null);
+    setLoading(true);
+    setError("");
+  }
+
+  useEffect(() => {
+    let ignore = false;
+    async function fetchShapes() {
+      if (!selectedUri) return;
+      try {
+        const data = await loadShaclShapes(selectedUri);
+        if (!ignore) {
+          setShapes(data.shapes);
+          const turtle = data.shacl_turtle;
+          setFullShacl(turtle);
+          setShacl((current) => current || turtle);
+          setSelectedShapeId(null);
+          setValidation(null);
+        }
+      } catch {
+        if (!ignore) setShapes([]);
+      } finally {
+        if (!ignore) setLoading(false);
+      }
+    }
+    void fetchShapes();
+    return () => {
+      ignore = true;
+    };
+  }, [selectedUri]);
 
   const handleGenerate = useCallback(async () => {
     if (!selectedUri) return;
diff --git a/explorer/src/workspaces/OntologyWorkspace/VersionsTab.tsx b/explorer/src/workspaces/OntologyWorkspace/VersionsTab.tsx
index f9176c32..33f2efec 100644
--- a/explorer/src/workspaces/OntologyWorkspace/VersionsTab.tsx
+++ b/explorer/src/workspaces/OntologyWorkspace/VersionsTab.tsx
@@ -74,9 +74,34 @@ export function VersionsTab() {
   }, []);
 
   useEffect(() => {
-    loadVersions();
-    loadProposals();
-  }, [loadVersions, loadProposals]);
+    let ignore = false;
+    async function fetchInitial() {
+      try {
+        const [propRes] = await Promise.all([
+          fetch("/api/ontology/proposals"),
+        ]);
+        if (propRes.ok) {
+          const propData = await propRes.json();
+          if (!ignore) setProposals(propData);
+        }
+      } catch (e) {
+        console.error("Failed to load proposals", e);
+      }
+      
+      if (!ontologyUri) return;
+      try {
+        const verRes = await fetch(`/api/ontology/versions/${encodeURIComponent(ontologyUri)}`);
+        if (verRes.ok) {
+          const verData = await verRes.json();
+          if (!ignore) setVersions(verData);
+        }
+      } catch (e) {
+        console.error("Failed to load versions", e);
+      }
+    }
+    void fetchInitial();
+    return () => { ignore = true; };
+  }, [ontologyUri]);
 
   const approveProposal = useCallback(async (proposalId: string) => {
     try {