only move cursor when needed

src/Aquarium.cpp

@@ -280,35 +280,38 @@ void Aquarium::initColorLookup() {
 void Aquarium::renderToScreen() {
   static std::string output;
   output.clear();
-  output.reserve(height * width * 20); // Reserve space for efficiency
+  output.reserve(height * width * 20);
+
+  int cursor_y = -1, cursor_x = -1;
 
   for (int y = 0; y < height; ++y) {
     for (int x = 0; x < width; ++x) {
       const Cell &newCell = currentFrame[y][x];
       Cell &oldCell = previousFrame[y][x];
 
-      if (newCell != oldCell) {
+      if (newCell == oldCell)
+        continue;
+
       oldCell = newCell;
 
-        // Move cursor to position
+      // Move cursor only when needed
+      if (cursor_y != y || cursor_x != x) {
         output += ANSI::moveTo(y, x);
+        cursor_y = y;
+        cursor_x = x;
+      }
 
-        // Reset cell
+      // Apply cell formatting and character
       output += ANSI::RESET_BLACK_BG;
-
-        // Set color and attributes
-        if (newCell.bold) {
+      if (newCell.bold)
         output += ANSI::BOLD;
-        }
       output += colorLookup[static_cast<unsigned char>(newCell.colorChar)];
-
-        // Add the character
       output += newCell.ch;
-      }
+
+      ++cursor_x;
     }
   }
 
-  // Output everything at once
   if (!output.empty()) {
     std::cout << output << std::flush;
   }