optimizations for mobile

src/lib/components/AudioVisualization.svelte

@@ -11,7 +11,11 @@
 	}>();
 
 	let particles: Particle[] = [];
-	const numParticles = 40; // Reduced from 60 for better performance with two visualizations
+	// Detect mobile for performance optimization
+	const isMobile = typeof window !== 'undefined' &&
+		(/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ||
+		window.innerWidth < 768);
+	const numParticles = isMobile ? 15 : 40; // Significantly reduced for mobile
 	let audioData: Float32Array | null = null;
 
 	// Cache frequently used calculations
@@ -19,6 +23,10 @@
 	let midRange = 0;
 	let trebleStart = 0;
 
+	// Track if user is scrolling to reduce load
+	let isScrolling = false;
+	let scrollTimeout: number;
+
 	class Particle {
 		x: number;
 		y: number;
@@ -42,13 +50,14 @@
 			this.alpha = p.random(100, 255);
 		}
 
-		update(p: p5, audioLevel: number, bass: number, mid: number) {
+		update(p: p5, audioLevel: number, bass: number, mid: number, isMobile: boolean) {
 			// Base movement - gentle constant speed
 			this.x += this.vx;
 			this.y += this.vy;
 
-			// Subtle audio reactive displacement (only every 3rd frame for performance)
-			if (p.frameCount % 3 === 0) {
+			// Subtle audio reactive displacement (less frequent on mobile)
+			const updateFrequency = isMobile ? 5 : 3;
+			if (p.frameCount % updateFrequency === 0) {
 				const displacement = audioLevel * 20;
 				const angle = p.noise(this.x * 0.01, this.y * 0.01, p.frameCount * 0.01) * p.TWO_PI;
 				this.x += p.cos(angle) * displacement * 0.05;
@@ -86,7 +95,8 @@
 	const sketch = (p: p5) => {
 		p.setup = () => {
 			p.createCanvas(width, height);
-			p.frameRate(30); // Reduce from 60fps to 30fps for better performance
+			// Lower framerate on mobile for better performance
+			p.frameRate(isMobile ? 20 : 30);
 			p.background(0);
 
 			// Initialize particles
@@ -94,11 +104,22 @@
 			for (let i = 0; i < numParticles; i++) {
 				particles.push(new Particle(p, i));
 			}
+
+			// Handle scroll events to pause visualization
+			if (typeof window !== 'undefined') {
+				window.addEventListener('scroll', () => {
+					isScrolling = true;
+					clearTimeout(scrollTimeout);
+					scrollTimeout = window.setTimeout(() => {
+						isScrolling = false;
+					}, 150);
+				}, { passive: true });
+			}
 		};
 
 		p.draw = () => {
-			// Pause visualization when document is hidden (tab not focused)
-			if (document.hidden) {
+			// Pause visualization when document is hidden, scrolling, or on mobile during heavy load
+			if (document.hidden || (isMobile && isScrolling)) {
 				return;
 			}
 			p.background(0, 30); // Fade effect
@@ -153,12 +174,12 @@
 
 				// Update and display particles
 				for (let i = 0; i < particles.length; i++) {
-					particles[i].update(p, audioLevel, bass, mid);
+					particles[i].update(p, audioLevel, bass, mid, isMobile);
 					particles[i].display(p, audioLevel);
 				}
 
-				// Draw connections less frequently (every other frame) for better performance
-				if (p.frameCount % 2 === 0) {
+				// Draw connections - skip on mobile for better performance
+				if (!isMobile && p.frameCount % 2 === 0) {
 					for (let i = 0; i < particles.length; i++) {
 						// Only check next 5 particles instead of all, reduces O(n²) significantly
 						for (let j = i + 1; j < Math.min(i + 6, particles.length); j++) {

src/lib/generators/air-quality/AirQualityGen.svelte

@@ -19,6 +19,12 @@
 	let isPlaying = $state(false);
 	let isInitialized = $state(false);
 
+	// Detect mobile for visualization sizing
+	const isMobile = typeof window !== 'undefined' &&
+		(/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ||
+		window.innerWidth < 768);
+	const vizSize = isMobile ? 280 : 400;
+
 	// Audio components
 	let noiseSynth: Tone.NoiseSynth | null = null;
 	let reverb: Tone.Reverb | null = null;
@@ -192,6 +198,26 @@
 	// Lifecycle
 	onMount(() => {
 		initializeAudio();
+
+		// Handle page visibility changes (screen sleep/wake, tab switching)
+		const handleVisibilityChange = async () => {
+			if (!document.hidden && isPlaying) {
+				// Page is visible again - resume audio context if suspended
+				if (Tone.getContext().state === 'suspended') {
+					await Tone.getContext().resume();
+				}
+				// Restart loop if it stopped
+				if (loop && loop.state !== 'started') {
+					loop.start(0);
+				}
+			}
+		};
+
+		document.addEventListener('visibilitychange', handleVisibilityChange);
+
+		return () => {
+			document.removeEventListener('visibilitychange', handleVisibilityChange);
+		};
 	});
 
 	onDestroy(() => {
@@ -243,6 +269,6 @@
 	</div>
 
 	<div class="flex items-center justify-center">
-		<AudioVisualization {isPlaying} {analyser} width={400} height={400} />
+		<AudioVisualization {isPlaying} {analyser} width={vizSize} height={vizSize} />
 	</div>
 </div>

src/lib/generators/weather/WeatherGen.svelte

@@ -31,6 +31,12 @@
 	let isPlaying = $state(false);
 	let isInitialized = $state(false);
 
+	// Detect mobile for visualization sizing
+	const isMobile = typeof window !== 'undefined' &&
+		(/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ||
+		window.innerWidth < 768);
+	const vizSize = isMobile ? 280 : 400;
+
 	// Audio components
 	let synth: Tone.PolySynth | null = null;
 	let arpSynth: Tone.Synth | null = null;
@@ -397,6 +403,26 @@
 	// Lifecycle
 	onMount(() => {
 		initializeAudio();
+
+		// Handle page visibility changes (screen sleep/wake, tab switching)
+		const handleVisibilityChange = async () => {
+			if (!document.hidden && isPlaying) {
+				// Page is visible again - resume audio context if suspended
+				if (Tone.getContext().state === 'suspended') {
+					await Tone.getContext().resume();
+				}
+				// Restart transport if it stopped
+				if (Tone.getTransport().state !== 'started') {
+					Tone.getTransport().start();
+				}
+			}
+		};
+
+		document.addEventListener('visibilitychange', handleVisibilityChange);
+
+		return () => {
+			document.removeEventListener('visibilitychange', handleVisibilityChange);
+		};
 	});
 
 	onDestroy(() => {
@@ -471,6 +497,6 @@
 	</div>
 
 	<div class="flex items-center justify-center">
-		<AudioVisualization {isPlaying} {analyser} width={400} height={400} />
+		<AudioVisualization {isPlaying} {analyser} width={vizSize} height={vizSize} />
 	</div>
 </div>