HeadSpin Proposes Speed Optimizations as Highest Productivity for


Overview and Methodology For Our Analysis




iPhone XS / Sprint / Palo Alto

Products Used:

HeadSpin Connected Intelligence Platform


  • Review multiple 3rd party SDKs that cause slowdown in launch time
  • Ensure that immediate content is loaded first before future content.
  • Optimize connection reuse
  • HeadSpin analyzed the latest version of the iOS app on a real iPhone XS in Palo Alto, on the Sprint network.
  • NO SDK, code change or instrumentation was needed to run the remote performance sessions.
  • HeadSpin’s AI engine sifted through network traffic, client-side metrics, and videos of the test execution to find areas of poor user experience and performance bottlenecks.
  • Recommendations were provided for every issue that was surfaced.

User Reviews is doing very well overall in terms of user ratings on the App Store.

HeadSpin looked at reviews in the App Store and found some users struggling with functional issues and technical errors. ratings is currently 4.6/5 on the App Store.


Insights and Recommendations

HeadSpin’s proprietary AI technology analyzes and prioritizes the core issues impacting critical user journeys. Using computer vision techniques to quantify blank screens, time to interact, loading time, loading or buffering animations, and content quality, our AI models can automatically diagnose server-side issues whether they arise from infrastructure deployment issues, poor performance, or API errors. For a custom analysis of your app, request a Performance Insight report from HeadSpin. 

HeadSpin Performance Session (link)


Analysed KPIs

Launch Time   3.5 sec  
   Add a ToDo  Instant  
   Find an assistant   5 sec

The sample performance analysis focusing on a typical critical user journey for Following are the top performance areas that can be optimized for

Slow Server The server response time for one or more api calls took more than 500ms which is considered to be slow. In particular calls made to had longer response times and this is where most of the performance improvements should take place.

Connection Reuse On a number of occasions the app didn’t reuse already opened TCP connections which adds additional overheads.

Domain Sharding The application downloaded resources from several subdomains in parallel, although domain sharding is a technique widely used in the web it can incur additional performance costs in Mobile applications.

The app can benefit from further detailed analysis into the different performance affecting issues which Headspin can assist with. One example is how does the app perform at different times of the day in particular during peak times? How does the app perform on different devices with different specs, or in different cities?

We have analyzed the overall performance during the below key journeys in order to identify any bottlenecks or performance issues.

Connection Reuse

TCP connections come with their own overheads, everytime a connection is opened those overheads add to the time of the task being executed.

The app created multiple connections in close succession to the same host.


HEADSPIN RECOMMENDATION: Check the keep-alive settings on the host server. If keep-alive connections aren’t enabled, or if the keep-alive timeout is set too low, client connections will be terminated prematurely, resulting in unnecessary TCP/TLS handshakes.

Slow Server

The application waited longer than 500 ms to receive the first byte in HTTP responses from this host.


HEADSPIN RECOMMENDATION: The slower than optimal response time could be due to a number of reasons, long server side operations, serving resources from the incorrect edge of a CDN.

We recommend that you investigate the above host and try to reduce the overall time to be within the optimal 500ms response time.

Domain Sharding

Your application used multiple subdomains to serve resources in parallel.

Request all resources from a single domain to reduce performance impact from connection re-use issues, DNS lookup time, and packet loss.
Domain sharding is a technique popular for the web, but can cause performance issues on mobile devices which have different connection pool limits. Each additional connection on a subdomain requires a DNS lookup and new TCP/TLS handshakes for each connection, causing significant overhead.


How to Work With HeadSpin

HeadSpin Powers Flawless Mobile App Performance

HeadSpin’s state-of-the-art Digital Experience Intelligence Platform™ will empower your engineering teams to:

  • Execute automation tests on real carrier-enabled devices worldwide
  • Discover performance bottlenecks
  • Collect and visualize your performance data
  • Seamlessly integrate with your CI/CD workflow
  • Monitor every critical user flow of your mobile experience
  • Pinpoint issues that cause performance regressions and impact user experience earlier in your development cycle
Overarching Areas of Opportunities

  • Launch new features confidently by monitoring and analyzing root causes of performance issues throughout the development life cycle
  • Drive new user installs and user engagement with optimized performance
  • Forge user trust and safety, accelerating consumer services for critical user paths across your apps and website
  • Benchmark KPIs for mobile performance to understand how your user experience for your mobile app and website compares to your peers in the same industry
  • Support localized testing across thousands of devices and 70+ countries around the world, on real devices under real-world conditions
Expert Holistic Consultation and Strategy 

HeadSpin has the product and solutions expertise to help you perfect the digital experience for your customers! Our team hails from digital pioneers, such as Google and Facebook, and has already delivered enhanced mobile-centric experiences for a diverse set of Fortune 1000 clients. HeadSpin’s strategic insights can help you:

  • Drive new user acquisition, user engagement, and feature adoption
  • Deploy app security measures on iOS and Android
  • Build consistent performance standards and experiences across all your mobile apps and websites 

... insight from HeadSpin helps us prioritize issues so we could deliver a better user experience.

Maria Zhang, CTO, Tinder