diff --git a/constants.h b/constants.h
index 3b6d2b2..60738c4 100644
--- a/constants.h
+++ b/constants.h
@@ -55,9 +55,14 @@
 #define SFG_LEVEL_ELEMENT_ACTIVE_DISTANCE 8
 
 /**
-  Time in ms after which AI will be recomputing its state (which also affects
-  how quickly death animation plays etc).
+  Time interval in ms after which AI will be updating (which also affects
+  speed of monster animation etc).
 */
-#define SFG_AI_UPDATE_INTERVAL 500
+#define SFG_AI_UPDATE_INTERVAL 300
+
+/**
+  Normal movement speed of monsters, in squares per second.
+*/
+#define SFG_MONSTER_MOVEMENT_SPEED 2
 
 #endif // guard
diff --git a/main.c b/main.c
index b8d2b0a..67f5b00 100755
--- a/main.c
+++ b/main.c
@@ -290,6 +290,13 @@ typedef struct
   #define SFG_AI_UPDATE_FRAME_INTERVAL 1
 #endif
 
+#define SFG_MONSTER_MOVE_UNITS_PER_FRAME \
+  (((SFG_MONSTER_MOVEMENT_SPEED * SFG_AI_UPDATE_FRAME_INTERVAL * 4) / SFG_FPS))
+
+#if SFG_MONSTER_MOVE_UNITS_PER_FRAME == 0
+  #define SFG_MONSTER_MOVE_UNITS_PER_FRAME 1
+#endif
+
 /*
   GLOBAL VARIABLES
 ===============================================================================
@@ -644,10 +651,8 @@ void SFG_blitImage(
           sY++;
         }
       }
-
       u++;
     }
-
     v++;
   }
 }
@@ -978,9 +983,9 @@ void SFG_playerRotateWeapon(uint8_t next)
   SFG_player.weapon %= 3;
 }
 
-void SFG_monsterPerformAI(SFG_MonsterRecord *monster, int8_t recomputeState)
+void SFG_monsterPerformAI(SFG_MonsterRecord *monster)
 {
-  // TODO
+  monster->coords[0] += SFG_MONSTER_MOVE_UNITS_PER_FRAME;
 }
 
 /**
@@ -1282,14 +1287,13 @@ void SFG_gameStep()
       SFG_currentLevel.checkedMonsterIndex = 0;
   }
 
-  int8_t recomputeAIState = ((SFG_gameFrame - SFG_currentLevel.frameStart) %
-    SFG_AI_UPDATE_FRAME_INTERVAL) == 0;
-
-  for (uint8_t i = 0; i < SFG_currentLevel.monsterRecordCount; ++i)
-    if (SFG_currentLevel.monsterRecords[i].stateType !=
-        SFG_MONSTER_STATE_INACTIVE)
-      SFG_monsterPerformAI(
-        &(SFG_currentLevel.monsterRecords[i]),recomputeAIState);
+  if (((SFG_gameFrame - SFG_currentLevel.frameStart) %
+    SFG_AI_UPDATE_FRAME_INTERVAL) == 0)
+    for (uint8_t i = 0; i < SFG_currentLevel.monsterRecordCount; ++i)
+      if (SFG_currentLevel.monsterRecords[i].stateType !=
+          SFG_MONSTER_STATE_INACTIVE)
+        SFG_monsterPerformAI(
+          &(SFG_currentLevel.monsterRecords[i]));
 }
 
 void SFG_clearScreen(uint8_t color)
diff --git a/settings.h b/settings.h
index fb3a2ee..fe40179 100644
--- a/settings.h
+++ b/settings.h
@@ -21,7 +21,9 @@
   Target FPS (frames per second). This sets the game logic FPS and will try to
   render at the same rate. If such fast rendering can't be achieved, frames will
   be droped, but the game logic will still be forced to run at this speed, so
-  the game may actually become slowed down if FPS is set too high.
+  the game may actually become slowed down if FPS is set too high. Too high FPS
+  can also negatively affect game speeds which are computed as integers and
+  rounding errors can occur soon, so don't set this to extreme values.
 */
 #define SFG_FPS 60