diff --git a/src/main/java/gripe/_90/appliede/me/misc/EMCInterfaceLogic.java b/src/main/java/gripe/_90/appliede/me/misc/EMCInterfaceLogic.java
index 304bba1..f000304 100644
--- a/src/main/java/gripe/_90/appliede/me/misc/EMCInterfaceLogic.java
+++ b/src/main/java/gripe/_90/appliede/me/misc/EMCInterfaceLogic.java
@@ -2,6 +2,7 @@
 
 import java.util.List;
 import java.util.Objects;
+import java.util.UUID;
 
 import org.jetbrains.annotations.Nullable;
 
@@ -54,13 +55,14 @@ public class EMCInterfaceLogic implements IActionHost, IGridTickable, IUpgradeab
     private final MEStorage localInvHandler;
     private final GenericStack[] plannedWork;
     private final IActionSource source = IActionSource.ofMachine(this);
+    private final UUID ownerUUID;
 
     private final LazyOptional<IItemHandler> storageHolder;
 
     @Nullable
     private WrappedEMCStorage emcStorage;
 
-    private boolean hasConfig = false;
+    private boolean hasConfig;
 
     public EMCInterfaceLogic(IManagedGridNode node, EMCInterfaceLogicHost host, Item is) {
         this(node, host, is, 9);
@@ -84,6 +86,9 @@ public EMCInterfaceLogic(IManagedGridNode node, EMCInterfaceLogicHost host, Item
         storage.useRegisteredCapacities();
 
         storageHolder = LazyOptional.of(() -> storage).lazyMap(GenericStackItemStorage::new);
+
+        var gridNode = mainNode.getNode();
+        ownerUUID = gridNode != null ? gridNode.getOwningPlayerProfileId() : null;
     }
 
     public ConfigInventory getConfig() {
@@ -116,17 +121,15 @@ private boolean storageFilter(AEKey what) {
             return true;
         }
 
-        var uuid = node.getOwningPlayerProfileId();
-
-        if (uuid == null) {
+        if (ownerUUID == null) {
             return false;
         }
 
         var knowledge = grid.getService(KnowledgeService.class);
-        return knowledge.knowsItem(item)
+        return knowledge.getKnownItems().contains(item)
                 || (isUpgradedWith(AppliedE.LEARNING_CARD.get())
                         && IEMCProxy.INSTANCE.hasValue(item.toStack())
-                        && knowledge.getProviderFor(uuid) != null);
+                        && knowledge.getProviderFor(ownerUUID) != null);
     }
 
     public void readFromNBT(CompoundTag tag) {
diff --git a/src/main/java/gripe/_90/appliede/me/service/EMCStorage.java b/src/main/java/gripe/_90/appliede/me/service/EMCStorage.java
index 4bfb5b2..68708d9 100644
--- a/src/main/java/gripe/_90/appliede/me/service/EMCStorage.java
+++ b/src/main/java/gripe/_90/appliede/me/service/EMCStorage.java
@@ -157,7 +157,7 @@ public long insertItem(
             return 0;
         }
 
-        if (!mayLearn && !service.knowsItem(what) || !IEMCProxy.INSTANCE.hasValue(what.toStack())) {
+        if (!mayLearn && !service.getKnownItems().contains(what) || !IEMCProxy.INSTANCE.hasValue(what.toStack())) {
             return 0;
         }
 
@@ -232,7 +232,7 @@ public long extractItem(AEItemKey what, long amount, Actionable mode, IActionSou
             return 0;
         }
 
-        if (amount <= 0 || !service.knowsItem(what)) {
+        if (amount <= 0 || !service.getKnownItems().contains(what)) {
             return 0;
         }
 
diff --git a/src/main/java/gripe/_90/appliede/me/service/KnowledgeService.java b/src/main/java/gripe/_90/appliede/me/service/KnowledgeService.java
index 1ef145c..3cad431 100644
--- a/src/main/java/gripe/_90/appliede/me/service/KnowledgeService.java
+++ b/src/main/java/gripe/_90/appliede/me/service/KnowledgeService.java
@@ -49,15 +49,20 @@ public class KnowledgeService implements IGridService, IGridServiceProvider {
     private final TeamProjectEHandler.Proxy tpeHandler = new TeamProjectEHandler.Proxy();
 
     private final IGrid grid;
+    private Set<AEItemKey> knownItemCache;
 
     public KnowledgeService(IGrid grid) {
         this.grid = grid;
-        MinecraftForge.EVENT_BUS.addListener((PlayerKnowledgeChangeEvent event) -> updatePatterns());
+        MinecraftForge.EVENT_BUS.addListener((PlayerKnowledgeChangeEvent event) -> {
+            knownItemCache = null;
+            updatePatterns();
+        });
     }
 
     @Override
     public void addNode(IGridNode gridNode, @Nullable CompoundTag savedData) {
         if (gridNode.getOwner() instanceof EMCModulePart module) {
+            knownItemCache = null;
             moduleNodes.add(module.getMainNode());
             var uuid = gridNode.getOwningPlayerProfileId();
 
@@ -72,6 +77,7 @@ public void addNode(IGridNode gridNode, @Nullable CompoundTag savedData) {
     @Override
     public void removeNode(IGridNode gridNode) {
         if (gridNode.getOwner() instanceof EMCModulePart module) {
+            knownItemCache = null;
             moduleNodes.remove(module.getMainNode());
             providers.clear();
             tpeHandler.clear();
@@ -137,11 +143,15 @@ public MEStorage getStorage(IManagedGridNode node) {
     }
 
     public Set<AEItemKey> getKnownItems() {
-        return getProviders().stream()
-                .flatMap(provider -> provider.getKnowledge().stream())
-                .map(item -> AEItemKey.of(item.createStack()))
-                .filter(Objects::nonNull)
-                .collect(Collectors.toUnmodifiableSet());
+        if (knownItemCache == null) {
+            knownItemCache = getProviders().stream()
+                    .flatMap(provider -> provider.getKnowledge().stream())
+                    .map(item -> AEItemKey.of(item.createStack()))
+                    .filter(Objects::nonNull)
+                    .collect(Collectors.toUnmodifiableSet());
+        }
+
+        return knownItemCache;
     }
 
     public List<IPatternDetails> getPatterns(IManagedGridNode node) {
@@ -188,10 +198,6 @@ BigInteger getEmc() {
                 .reduce(BigInteger.ZERO, BigInteger::add);
     }
 
-    public boolean knowsItem(AEItemKey item) {
-        return getProviders().stream().anyMatch(provider -> provider.hasKnowledge(item.toStack()));
-    }
-
     public boolean isTrackingPlayer(Player player) {
         var uuid = player.getUUID();
         return providers.containsKey(uuid) || tpeHandler.isPlayerInTrackedTeam(uuid);