Throttle the display updates to once every 8 ticks.

coords/src/data/io.totemo.coords/functions/coords-display.mcfunction

@@ -0,0 +1,46 @@
+# Get player X, Y, Z and Yaw angle. Store as X, Y, Z, Bearing objectives.
+execute as @a store result score @s X run data get entity @s Pos[0] 1.0
+execute as @a store result score @s Y run data get entity @s Pos[1] 1.0
+execute as @a store result score @s Z run data get entity @s Pos[2] 1.0
+execute as @a store result score @s Bearing run data get entity @s Rotation[0]
+
+# Adjust bearing to compass convention.
+scoreboard players operation @a Bearing += 540 const
+scoreboard players operation @a Bearing %= 360 const
+
+# Set Octant to 0..7: 
+# First set Octant = Bearing, longhand.
+execute as @a store result score @s Octant run scoreboard players get @s Bearing
+scoreboard players operation @a Octant *= 2 const
+scoreboard players operation @a Octant += 45 const
+scoreboard players operation @a Octant /= 90 const
+scoreboard players operation @a Octant %= 8 const
+
+# Debugging Bearing and Octant:
+#title @a title {"text":""}
+#title @a subtitle [{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"},{"text":" B ","color":"gray"},{"score":{"name":"*","objective":"Bearing"},"color":"white"},{"text":" O ","color":"gray"},{"score":{"name":"*","objective":"Octant"},"color":"white"}]
+
+# N: Octant = 0
+title @a[scores={Octant=0,CoordsHidden=0}] actionbar [{"text":"N  ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
+
+# NE: Octant = 1
+title @a[scores={Octant=1,CoordsHidden=0}] actionbar [{"text":"NE ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
+
+# E: Octant = 2
+title @a[scores={Octant=2,CoordsHidden=0}] actionbar [{"text":"E  ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
+
+# SE: Octant = 3
+title @a[scores={Octant=3,CoordsHidden=0}] actionbar [{"text":"SE ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
+
+# S: Octant = 4
+title @a[scores={Octant=4,CoordsHidden=0}] actionbar [{"text":"S  ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
+
+# SW: Octant = 5
+title @a[scores={Octant=5,CoordsHidden=0}] actionbar [{"text":"SW ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
+
+# W: Octant = 6
+title @a[scores={Octant=6,CoordsHidden=0}] actionbar [{"text":"W  ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
+
+# NW: Octant = 7
+title @a[scores={Octant=7,CoordsHidden=0}] actionbar [{"text":"NW ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
+

coords/src/data/io.totemo.coords/functions/coords-load.mcfunction

@@ -1,3 +1,4 @@
+# TODO: I should prefix all my objectives to avoid name clashes.
 scoreboard objectives add X dummy
 scoreboard objectives add Y dummy
 scoreboard objectives add Z dummy
@@ -8,10 +9,12 @@ scoreboard objectives add Octant dummy
 # CoordsHidden = 1 for hidden, 0 for visible.
 scoreboard objectives add CoordsHidden dummy
 
-scoreboard objectives add const dummy
+# Per-player count used to avoid updating titles every tick.
+scoreboard objectives add itc.Tick dummy
 
 # Represent constants as <name> <objective> <value>, with the objective "const".
 # Scoreboard values are always integers.
+scoreboard objectives add const dummy
 scoreboard players set 0 const 0
 scoreboard players set 1 const 1
 scoreboard players set 2 const 2

coords/src/data/io.totemo.coords/functions/coords-tick.mcfunction

@@ -1,49 +1,14 @@
 # Initialise CoordsHidden to 0 when unset.
 scoreboard players add @a CoordsHidden 0
 
-# Get player X, Y, Z and Yaw angle. Store as X, Y, Z, Bearing objectives.
-execute as @a store result score @s X run data get entity @s Pos[0] 1.0
-execute as @a store result score @s Y run data get entity @s Pos[1] 1.0
-execute as @a store result score @s Z run data get entity @s Pos[2] 1.0
-execute as @a store result score @s Bearing run data get entity @s Rotation[0]
+# If not initialised, itc.Tick = 0.
+scoreboard players add @a itc.Tick 0
 
-# Adjust bearing to compass convention.
-scoreboard players operation @a Bearing += 540 const
-scoreboard players operation @a Bearing %= 360 const
+# itc.Tick = (itcTick + 1) % 8
+scoreboard players operation @a itc.Tick += 1 const
+scoreboard players operation @a itc.Tick %= 8 const
 
-# Set Octant to 0..7: 
-# First set Octant = Bearing, longhand.
-execute as @a store result score @s Octant run scoreboard players get @s Bearing
-scoreboard players operation @a Octant *= 2 const
-scoreboard players operation @a Octant += 45 const
-scoreboard players operation @a Octant /= 90 const
-scoreboard players operation @a Octant %= 8 const
+# Update display when itc.Tick is 0.
+execute as @a[scores={itc.Tick=0}] run function io.totemo.coords:coords-display
 
-# Debugging Bearing and Octant:
-#title @a title {"text":""}
-#title @a subtitle [{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"},{"text":" B ","color":"gray"},{"score":{"name":"*","objective":"Bearing"},"color":"white"},{"text":" O ","color":"gray"},{"score":{"name":"*","objective":"Octant"},"color":"white"}]
-
-# N: Octant = 0
-title @a[scores={Octant=0,CoordsHidden=0}] actionbar [{"text":"N  ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
-
-# NE: Octant = 1
-title @a[scores={Octant=1,CoordsHidden=0}] actionbar [{"text":"NE ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
-
-# E: Octant = 2
-title @a[scores={Octant=2,CoordsHidden=0}] actionbar [{"text":"E  ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
-
-# SE: Octant = 3
-title @a[scores={Octant=3,CoordsHidden=0}] actionbar [{"text":"SE ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
-
-# S: Octant = 4
-title @a[scores={Octant=4,CoordsHidden=0}] actionbar [{"text":"S  ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
-
-# SW: Octant = 5
-title @a[scores={Octant=5,CoordsHidden=0}] actionbar [{"text":"SW ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
-
-# W: Octant = 6
-title @a[scores={Octant=6,CoordsHidden=0}] actionbar [{"text":"W  ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]
-
-# NW: Octant = 7
-title @a[scores={Octant=7,CoordsHidden=0}] actionbar [{"text":"NW ","color":"white"},{"text":"X ","color":"gray"},{"score":{"name":"*","objective":"X"},"color":"white"},{"text":" Y ","color":"gray"},{"score":{"name":"*","objective":"Y"},"color":"white"},{"text":" Z ","color":"gray"},{"score":{"name":"*","objective":"Z"},"color":"white"}]