1.03 for iOS and 1.5.0 for Android

ios/OpenClimb/Views/AnalyticsView.swift

@@ -105,9 +105,26 @@ struct ProgressChartSection: View {
     @EnvironmentObject var dataManager: ClimbingDataManager
     @State private var selectedSystem: DifficultySystem = .vScale
     @State private var showAllTime: Bool = true
+    @State private var cachedGradeCountData: [GradeCount] = []
+    @State private var lastCalculationDate: Date = Date.distantPast
+    @State private var lastDataHash: Int = 0
 
     private var gradeCountData: [GradeCount] {
-        calculateGradeCounts()
+        let currentHash =
+            dataManager.problems.count + dataManager.attempts.count + (showAllTime ? 1 : 0)
+        let now = Date()
+
+        // Recalculate only if data changed or cache is older than 30 seconds
+        if currentHash != lastDataHash || now.timeIntervalSince(lastCalculationDate) > 30 {
+            let newData = calculateGradeCounts()
+            DispatchQueue.main.async {
+                self.cachedGradeCountData = newData
+                self.lastCalculationDate = now
+                self.lastDataHash = currentHash
+            }
+        }
+
+        return cachedGradeCountData.isEmpty ? calculateGradeCounts() : cachedGradeCountData
     }
 
     private var usedSystems: [DifficultySystem] {