perf(rendering): ignore unit layers with no units

core/src/com/unciv/ui/components/tilegroups/layers/TileLayerUnitFlag.kt

@@ -1,5 +1,6 @@
 package com.unciv.ui.components.tilegroups.layers
 
+import com.badlogic.gdx.graphics.g2d.Batch
 import com.badlogic.gdx.scenes.scene2d.Touchable
 import com.badlogic.gdx.scenes.scene2d.ui.Table
 import com.badlogic.gdx.utils.Align
@@ -26,10 +27,15 @@ class TileLayerUnitFlag(tileGroup: TileGroup, size: Float) : TileLayer(tileGroup
     }
 
     override fun act(delta: Float) { // No 'snapshotting' since we trust it will remain the same
+        if (civilianUnitIcon == null && militaryUnitIcon == null)
+            return
         for (child in children)
             child.act(delta)
     }
 
+    // For perf profiling
+    override fun draw(batch: Batch?, parentAlpha: Float) = super.draw(batch, parentAlpha)
+
     private fun clearSlots() {
         civilianUnitIcon?.remove()
         militaryUnitIcon?.remove()

core/src/com/unciv/ui/components/tilegroups/layers/TileLayerUnitSprite.kt

@@ -1,5 +1,6 @@
 package com.unciv.ui.components.tilegroups.layers
 
+import com.badlogic.gdx.graphics.g2d.Batch
 import com.badlogic.gdx.scenes.scene2d.Actor
 import com.badlogic.gdx.scenes.scene2d.Group
 import com.unciv.UncivGame
@@ -10,6 +11,9 @@ import com.unciv.ui.images.ImageGetter
 import com.unciv.ui.components.tilegroups.TileGroup
 
 class UnitSpriteSlot : Group() {
+    init {
+        isTransform = false
+    }
     var imageLocation = ""
 }
 
@@ -90,4 +94,9 @@ class TileLayerUnitSprite(tileGroup: TileGroup, size: Float) : TileLayer(tileGro
         civilianSlot.imageLocation = ""
         militarySlot.imageLocation = ""
     }
+
+    override fun draw(batch: Batch?, parentAlpha: Float) {
+        if (civilianSlot.imageLocation.isEmpty() && militarySlot.imageLocation.isEmpty()) return
+        super.draw(batch, parentAlpha)
+    }
 }

core/src/com/unciv/ui/components/widgets/UnitIconGroup.kt

@@ -87,7 +87,6 @@ class UnitIconGroup(val unit: MapUnit, val size: Float) : Group() {
     private var flagMask: Image? = getBackgroundMaskForUnit()
 
     init {
-
         isTransform = false // performance helper - nothing here is rotated or scaled
         color.a *= UncivGame.Current.settings.unitIconOpacity
 

docs/Modders/uniques.md

@@ -962,9 +962,6 @@ Simple unique parameters are explained by mouseover. Complex parameters are expl
 ??? example  "Can only heal by pillaging"
 	Applicable to: Global, Unit
 
-??? example  "Defense bonus when embarked"
-	Applicable to: Global, Unit
-
 ??? example  "[relativeAmount]% maintenance costs"
 	Example: "[+20]% maintenance costs"
 
@@ -1901,9 +1898,6 @@ Simple unique parameters are explained by mouseover. Complex parameters are expl
 
 	Applicable to: Unit
 
-??? example  "Defense bonus when embarked"
-	Applicable to: Global, Unit
-
 ??? example  "No Sight"
 	Applicable to: Unit