diff --git a/src/game/GameApp.ts b/src/game/GameApp.ts
index 5409b48..bebed4c 100644
--- a/src/game/GameApp.ts
+++ b/src/game/GameApp.ts
@@ -102,6 +102,7 @@ export class GameApp {
   private readonly fleetWindowTitleEl: HTMLHeadingElement;
   private readonly debugWindowEl: HTMLDivElement;
   private readonly sessionActionsEl: HTMLDivElement;
+  private lastShipWindowMarkup = "";
   private universe: UniverseDefinition;
 
   constructor(container: HTMLElement) {
@@ -2123,7 +2124,11 @@ export class GameApp {
     this.ordersEl.dataset.mode = this.selectedStation ? "station" : this.selection.length > 0 ? "ships" : "none";
     this.fleetWindowEl.dataset.open = this.windowState["fleet-command"] ? "true" : "false";
     this.fleetWindowTitleEl.textContent = "Ships";
-    this.fleetWindowBodyEl.innerHTML = getShipWindowMarkup(this.ships, this.selection);
+    const shipWindowMarkup = getShipWindowMarkup(this.ships, this.selection);
+    if (shipWindowMarkup !== this.lastShipWindowMarkup) {
+      this.fleetWindowBodyEl.innerHTML = shipWindowMarkup;
+      this.lastShipWindowMarkup = shipWindowMarkup;
+    }
     this.debugWindowEl.dataset.open = this.windowState.debug ? "true" : "false";
   }