diff --git a/apps/openmw/mwbase/mechanicsmanager.hpp b/apps/openmw/mwbase/mechanicsmanager.hpp
index f56f68b780..091b851261 100644
--- a/apps/openmw/mwbase/mechanicsmanager.hpp
+++ b/apps/openmw/mwbase/mechanicsmanager.hpp
@@ -104,7 +104,7 @@ namespace MWBase
         ///< Return the number of deaths for actors with the given ID.
 
         /// Check if \a observer is potentially aware of \a ptr. Does not do a line of sight check!
-        virtual bool awarenessCheck(const MWWorld::Ptr& ptr, const MWWorld::Ptr& observer) = 0;
+        virtual bool awarenessCheck(const MWWorld::Ptr& ptr, const MWWorld::Ptr& observer, bool useCache = true) = 0;
 
         /// Makes \a ptr fight \a target. Also shouts a combat taunt.
         virtual void startCombat(
diff --git a/apps/openmw/mwmechanics/actors.cpp b/apps/openmw/mwmechanics/actors.cpp
index fd70671e85..04f4e12b65 100644
--- a/apps/openmw/mwmechanics/actors.cpp
+++ b/apps/openmw/mwmechanics/actors.cpp
@@ -410,6 +410,7 @@ namespace MWMechanics
 
     void Actors::updateActor(const MWWorld::Ptr& ptr, float duration) const
     {
+        ptr.getClass().getCreatureStats(ptr).updateAwareness(duration);
         // magic effects
         adjustMagicEffects(ptr, duration);
 
diff --git a/apps/openmw/mwmechanics/aicombataction.cpp b/apps/openmw/mwmechanics/aicombataction.cpp
index 91d2a9bbb8..ac59de0426 100644
--- a/apps/openmw/mwmechanics/aicombataction.cpp
+++ b/apps/openmw/mwmechanics/aicombataction.cpp
@@ -433,7 +433,7 @@ namespace MWMechanics
         ESM::Position enemyPos = enemy.getRefData().getPosition();
 
         if (isTargetMagicallyHidden(enemy)
-            && !MWBase::Environment::get().getMechanicsManager()->awarenessCheck(enemy, actor))
+            && !MWBase::Environment::get().getMechanicsManager()->awarenessCheck(enemy, actor, false))
         {
             return false;
         }
diff --git a/apps/openmw/mwmechanics/aipursue.cpp b/apps/openmw/mwmechanics/aipursue.cpp
index 461db45133..1dbbddd218 100644
--- a/apps/openmw/mwmechanics/aipursue.cpp
+++ b/apps/openmw/mwmechanics/aipursue.cpp
@@ -42,7 +42,7 @@ namespace MWMechanics
             return true;
 
         if (isTargetMagicallyHidden(target)
-            && !MWBase::Environment::get().getMechanicsManager()->awarenessCheck(target, actor))
+            && !MWBase::Environment::get().getMechanicsManager()->awarenessCheck(target, actor, false))
             return false;
 
         if (target.getClass().getCreatureStats(target).isDead())
diff --git a/apps/openmw/mwmechanics/creaturestats.cpp b/apps/openmw/mwmechanics/creaturestats.cpp
index 41af96a630..0a14d46097 100644
--- a/apps/openmw/mwmechanics/creaturestats.cpp
+++ b/apps/openmw/mwmechanics/creaturestats.cpp
@@ -686,4 +686,24 @@ namespace MWMechanics
     {
         return mSummonGraveyard;
     }
+
+    void CreatureStats::updateAwareness(float duration)
+    {
+        mAwarenessTimer += duration;
+        // Only reroll for awareness every 5 seconds
+        if (mAwarenessTimer >= 5.f)
+        {
+            mAwarenessTimer = 0.f;
+            mAwarenessRoll = -1;
+        }
+    }
+
+    int CreatureStats::getAwarenessRoll()
+    {
+        if (mAwarenessRoll >= 0)
+            return mAwarenessRoll;
+        auto& prng = MWBase::Environment::get().getWorld()->getPrng();
+        mAwarenessRoll = Misc::Rng::roll0to99(prng);
+        return mAwarenessRoll;
+    }
 }
diff --git a/apps/openmw/mwmechanics/creaturestats.hpp b/apps/openmw/mwmechanics/creaturestats.hpp
index 02312385d7..aa46e9504f 100644
--- a/apps/openmw/mwmechanics/creaturestats.hpp
+++ b/apps/openmw/mwmechanics/creaturestats.hpp
@@ -90,6 +90,9 @@ namespace MWMechanics
         // This may be necessary when the creature is in an inactive cell.
         std::vector<int> mSummonGraveyard;
 
+        float mAwarenessTimer = 0.f;
+        int mAwarenessRoll = -1;
+
     protected:
         std::string mAttackType;
         int mLevel = 0;
@@ -300,6 +303,9 @@ namespace MWMechanics
         void setTeleported(bool v) { mTeleported = v; }
 
         const std::map<ESM::RefId, AttributeValue>& getAttributes() const { return mAttributes; }
+
+        void updateAwareness(float duration);
+        int getAwarenessRoll();
     };
 }
 
diff --git a/apps/openmw/mwmechanics/mechanicsmanagerimp.cpp b/apps/openmw/mwmechanics/mechanicsmanagerimp.cpp
index 4cfe1027c5..df6ba53e35 100644
--- a/apps/openmw/mwmechanics/mechanicsmanagerimp.cpp
+++ b/apps/openmw/mwmechanics/mechanicsmanagerimp.cpp
@@ -1609,7 +1609,7 @@ namespace MWMechanics
         commitCrime(player, victim, MWBase::MechanicsManager::OT_Murder);
     }
 
-    bool MechanicsManager::awarenessCheck(const MWWorld::Ptr& ptr, const MWWorld::Ptr& observer)
+    bool MechanicsManager::awarenessCheck(const MWWorld::Ptr& ptr, const MWWorld::Ptr& observer, bool useCache)
     {
         if (observer.getClass().getCreatureStats(observer).isDead() || !observer.getRefData().isEnabled())
             return false;
@@ -1676,8 +1676,10 @@ namespace MWMechanics
         }
 
         float target = x - y;
+        if (useCache)
+            return observerStats.getAwarenessRoll() >= target;
         auto& prng = MWBase::Environment::get().getWorld()->getPrng();
-        return (Misc::Rng::roll0to99(prng) >= target);
+        return Misc::Rng::roll0to99(prng) >= target;
     }
 
     void MechanicsManager::startCombat(
diff --git a/apps/openmw/mwmechanics/mechanicsmanagerimp.hpp b/apps/openmw/mwmechanics/mechanicsmanagerimp.hpp
index 247bae1a5b..11ef21852c 100644
--- a/apps/openmw/mwmechanics/mechanicsmanagerimp.hpp
+++ b/apps/openmw/mwmechanics/mechanicsmanagerimp.hpp
@@ -102,7 +102,7 @@ namespace MWMechanics
         ///< Perform a persuasion action on NPC
 
         /// Check if \a observer is potentially aware of \a ptr. Does not do a line of sight check!
-        bool awarenessCheck(const MWWorld::Ptr& ptr, const MWWorld::Ptr& observer) override;
+        bool awarenessCheck(const MWWorld::Ptr& ptr, const MWWorld::Ptr& observer, bool useCache = true) override;
 
         /// Makes \a ptr fight \a target. Also shouts a combat taunt.
         void startCombat(