10 seconds is around the limit for keeping the user's attention.After 3 seconds, 40% of visitors will abandon your site.Users expect a site to load in 2 seconds.One second is about the limit for the user's flow of thought to stay uninterrupted.Under 100 milliseconds is perceived as instantaneous.How fast is fast enough for a web application? Here's a quick overview of key performance metrics: There are many performance rules out there, but ultimately, load time is the only performance metric that matters. When you understand that performance is key to a great user experience, you need tools that will do one thing very well, and that's to measure the user's perceived load time. The value of performanceīefore talking tools, let's consider load times and the value of performance. But most engineering teams do not regularly test the performance and scalability of their infrastructure, and most lack the tools to properly do so.Īlthough you can find plenty of commercial tool options out there, for the right organization, free and open-source tools may be a good alternative-or the perfect complement to your commercial tool set. ![]() Remember that top engineering organizations consider performance not as nice-to-have, but as a crucial feature of their products. The reason for this major outage, according to the folks at Robinhood, was that their system struggled with unprecedented load and crashed. How many users and how much long-term revenue do you think Robinhood lost because of bad performance? Recently, the stock-trading app Robinhood went down for 24 hours during what was probably one of the stock market's most significant swings. ![]() The failure of a mission-critical web application can be costly.
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