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What are Third-party Components Doing to Your Site's Performance?

Andy Davies (NCC Group), Simon Hearne (NCC Group)
Location: 212 Level: Intermediate
Average rating: ****.
(4.59, 17 ratings)
Slides:   1-PDF 

We increasingly rely on third-party scripts to deliver site features – analytics, adverts, multi-variant testing, comments, recommendations, retargeting, social sharing etc.

Often these scripts get added with the seemingly innocent “it’s just a snippet of JavaScript”, but they can have a dramatic impact on performance, from slowing the page down to breaking it completely when a third-party has availability issues.

Despite this explosion in third-party components there is little information on how they interact with our sites and what their impact on performance is.

In this session we’ll share the insights we have gained from analysing the impact of 3rd party scripts on the performance of sites we monitor. We’ll look at which third-parties are the most popular, how they interact with our pages and are they fast, slow, or inconsistent?

Attendees will come away with a better understanding of third-party performance and pointers on how to make informed decisions when choosing their third-parties.

Photo of Andy Davies

Andy Davies

NCC Group

Andy is Associate Director for Web Performance at NCC Group, where he helps clients to measure and improve the performance of their sites.

He wrote ‘The Pocket Guide to Web Performance’ for Five Simple Steps, and is currently co-authoring ‘Using WebPagetest’ for O’Reilly.

Photo of Simon Hearne

Simon Hearne

NCC Group

Simon is a Web Performance Technical Consultant at NCC Group where his time is split between helping clients improve their web performance and working on exciting new projects.

Simon studied Artificial Intelligence and Web Science before joining NCC Group.