Mobile Speed Optimization Agency

Expert Mobile Speed Optimization Services

Mobile speed optimization services that fix the JavaScript, image, and font issues dragging your mobile Lighthouse score below 40 and costing you conversions.

Mobile performance is fundamentally different from desktop. A page that loads in 2 seconds on desktop can take 8–12 seconds on a mid-range phone over a cellular connection. The CPU is slower, the network is higher latency, and the viewport is smaller, requiring different image sizes, different JavaScript strategies, and different rendering approaches.

Most agencies report a desktop score and call it done. We don't. Every engagement is led by a mobile speed optimization expert who profiles your site on real mobile CPUs and cellular networks, then reduces JavaScript payloads, optimizes responsive images, applies Critical CSS, and tunes touch responsiveness so all three Core Web Vitals pass on mobile field data.

Online stores where 60–80% of traffic is mobile but mobile conversion rates lag desktop by 50%+, because product pages, collection views, and checkout flows are too slow on phones.

Local businesses where mobile search dominates, 'near me' searches are 95% mobile, and a slow mobile site means losing customers to faster competitors in local pack results.

SaaS and lead gen sites running mobile paid traffic where slow mobile pages waste ad spend, every second of mobile delay reduces form submissions and increases cost per acquisition.

Content sites where mobile readers bounce faster than desktop, a 3-second mobile load time loses 53% of visitors before they see a single word.

Your Mobile Score Is Under 40

Google Lighthouse simulates a Moto G Power on throttled 4G, a mid-range phone with limited CPU and high network latency. Most sites score 20–40 under these conditions because they weren't optimized for constrained devices. Your desktop score might be 85, but Google ranks you based on your mobile score.

JavaScript Overwhelms Mobile CPUs

Desktop processors handle 2MB of JavaScript in 200ms. A mid-range mobile processor takes 2,000ms+ for the same code, creating Long Tasks that block the main thread, freeze the UI, and fail INP. Your JavaScript bundle isn't 'too big' for desktop; it's catastrophic for mobile.

Images Are Sized for Desktop

Serving a 1920×1080 hero image to a 390px-wide phone wastes 80% of the bytes. Without responsive srcset, every image downloads at desktop resolution, consuming cellular bandwidth and delaying LCP. On a 4G connection, this alone can add 3–5 seconds to load time.

Touch Interactions Feel Sluggish

When users tap buttons, menus, or form fields on your mobile site, they expect instant response. But heavy event handlers, layout thrashing, and main-thread blocking create 200–500ms+ delays between tap and response, failing INP and making your site feel broken.

Mobile Layout Shifts Destroy UX

Ads, images, fonts, and dynamically injected content cause layout shifts that are especially frustrating on mobile, where a small shift can move the content the user is reading completely off-screen. CLS failures on mobile directly hurt rankings and user trust.

Cellular Networks Add Latency

Even on 4G LTE, each network round-trip adds 50–100ms of latency, far more than desktop connections. If your page makes 80+ requests (common with third-party scripts), the cumulative latency on mobile adds seconds to load time. Request reduction and connection management are critical.

53%

of mobile visitors leave if a page takes longer than 3 seconds to load

~7%

conversion loss from a 1-second delay

70%

more organic traffic for sites passing Core Web Vitals

~1%

more conversions per 100ms faster load time

Deliverables

What You'll Receive

Every engagement includes comprehensive documentation and reporting.

Mobile CPU Profiling

We use Chrome DevTools CPU throttling to simulate mid-range mobile processors, identifying exactly which scripts and functions consume the most CPU time on mobile. This reveals bottlenecks invisible in desktop testing.

Mobile Network Analysis

We analyze request waterfalls under throttled 4G conditions, identifying connection chains, unnecessary round-trips, and resources that block rendering on high-latency cellular networks.

Responsive Image Engineering

We implement proper srcset and sizes attributes for every image, delivering optimally-sized files for each mobile viewport width, reducing image payload by 60–80% on mobile without quality loss.

Mobile JavaScript Strategy

We code-split bundles by route and viewport, defer non-critical scripts, break Long Tasks with yielding patterns, and eliminate unused code, specifically targeting the mobile CPU bottleneck.

Touch Interaction Optimization

We profile every tappable element on mobile and optimize event handlers for instant response, passive listeners, debouncing, avoiding forced reflows, and yielding back to the main thread.

Mobile CLS Prevention

We trace every layout shift on mobile viewports, images without dimensions, late-loading fonts, dynamically injected ads and content, and fix each source with explicit sizing and content pre-allocation.

"Platterful saw major improvements in site speed after working with Matt and the PageSpeed Matters team. They took our mobile score from the 50s to over 90 while keeping SEO intact. They were responsive, helpful, and continued to support us even after the project ended. Highly recommend."

"Matt and the PageSpeed Matters team successfully helped us improve our page speed load times and get our core web vitals into the green."

"Couldn't be any happier with the work done by Matt and the PageSpeed Matters team, they were communicative, open, honest."