Set the initial capacity of ArrayLists where possible

photon-core/src/main/java/org/photonvision/common/configuration/SqlConfigProvider.java

@@ -649,7 +649,7 @@ private HashMap<String, CameraConfiguration> loadCameraConfigs(Connection conn)
                         JacksonUtils.deserialize(
                                 result.getString(Columns.CAM_PIPELINE_JSONS), dummyList.getClass());
 
-                List<CVPipelineSettings> loadedSettings = new ArrayList<>();
+                List<CVPipelineSettings> loadedSettings = new ArrayList<>(pipelineSettings.size());
                 for (var setting : pipelineSettings) {
                     if (setting instanceof String str) {
                         loadedSettings.add(JacksonUtils.deserialize(str, CVPipelineSettings.class));

photon-core/src/main/java/org/photonvision/common/hardware/GPIO/pi/PigpioSocket.java

@@ -190,7 +190,7 @@ private void addBlinkPulsesToWaveform(int pulseTimeMillis, int blinks, int pinNo
         }
 
         try {
-            ArrayList<PigpioPulse> pulses = new ArrayList<>();
+            ArrayList<PigpioPulse> pulses = new ArrayList<>(blinks * 2);
             var startPulse = new PigpioPulse(pinNo, 0, pulseTimeMillis * 1000);
             var endPulse = new PigpioPulse(0, pinNo, pulseTimeMillis * 1000);
 

photon-core/src/main/java/org/photonvision/common/hardware/VisionLED.java

@@ -36,7 +36,7 @@ public class VisionLED {
     private static final Logger logger = new Logger(VisionLED.class, LogGroup.VisionModule);
 
     private final int[] ledPins;
-    private final List<GPIOBase> visionLEDs = new ArrayList<>();
+    private final List<GPIOBase> visionLEDs;
     private final int brightnessMin;
     private final int brightnessMax;
     private final PigpioSocket pigpioSocket;
@@ -58,7 +58,8 @@ public VisionLED(
         this.brightnessMax = brightnessMax;
         this.pigpioSocket = pigpioSocket;
         this.modeConsumer = visionLEDmode;
-        this.ledPins = ledPins.stream().mapToInt(i -> i).toArray();
+        this.ledPins = ledPins.stream().mapToInt(Integer::intValue).toArray();
+        visionLEDs = new ArrayList<>(this.ledPins.length);
         ledPins.forEach(
                 pin -> {
                     if (Platform.isRaspberryPi()) {

photon-core/src/main/java/org/photonvision/vision/objects/Letterbox.java

@@ -86,7 +86,7 @@ public static Letterbox letterbox(Mat frame, Mat letterboxed, Size newShape, Sca
      * @return The resized detections
      */
     public List<NeuralNetworkPipeResult> resizeDetections(List<NeuralNetworkPipeResult> unscaled) {
-        var ret = new ArrayList<NeuralNetworkPipeResult>();
+        var ret = new ArrayList<NeuralNetworkPipeResult>(unscaled.size());
 
         for (var t : unscaled) {
             var scale = 1.0 / this.scale;

photon-core/src/main/java/org/photonvision/vision/pipe/impl/Calibrate3dPipe.java

@@ -400,7 +400,7 @@ private List<BoardObservation> createObservations(
             }
             var img_pts_reprojected_list = img_pts_reprojected.toList();
 
-            var reprojectionError = new ArrayList<Point>();
+            var reprojectionError = new ArrayList<Point>(img_pts_reprojected_list.size());
             for (int j = 0; j < img_pts_reprojected_list.size(); j++) {
                 // error = (measured - expected)
                 var measured = img_pts_reprojected_list.get(j);

photon-core/src/main/java/org/photonvision/vision/pipe/impl/Collect2dTargetsPipe.java

@@ -37,7 +37,7 @@ public class Collect2dTargetsPipe
      */
     @Override
     protected List<TrackedTarget> process(List<PotentialTarget> in) {
-        List<TrackedTarget> targets = new ArrayList<>();
+        List<TrackedTarget> targets = new ArrayList<>(in.size());
 
         var calculationParams =
                 new TrackedTarget.TargetCalculationParameters(