# Performance monitoring Slow pages cost sales. How long do you wait for a website to load? And how long are your visitors willing to wait on your site? We'll notify you as soon as we detect your website is getting slow. [ Start monitoring ](https://ohdear.app/register) 10 day free trial No credit card required ## Set a maximum performance budget Your currency is time Without constant monitoring and reporting, how would you know if you're still within your performance goals? In Oh Dear, you can configure the maximum loading time for any website or API endpoint. Once it's exceeded, we can let you know. Do you always want to have the sites loaded under 500ms? We can help you monitor that! ## Receive smart and instant alerts when performance drops We believe in two kinds of important alerts when it comes to performance: hard limits and sudden changes. Per website, you're able to define a hard performance limit that should not be crossed. Once we detect the website is consistently crossing that threshold, we'll let you know. It's very powerful to know when your site suddenly becomes faster or slower. It could be due to increased load on your servers, it could be a faulty new deploy that only renders half the page, ... whatever it may be, you'll find our sudden change alerts worthy of your attention. ## View a detailed history See the last 7 day summary for every site We keep detailed metrics with every check we perform. Over time, it becomes more useful to see aggregates of this data - trending metrics that tell you at a glance if things are improving or not. You'll be able to see the last 7 day summary for every site, together with all historic trending data from the moment the site was added to Oh Dear. Right from your dashboard, you can see if your sites are getting faster or if they're slowing down. ## Keep an eye on the dashboard The performance for all your sites, at your fingertips Your dashboard will give you a birds-eye view of all performance charts for your sites. If things are too slow, we'll clearly mark them out so you can quickly get a feel for all your websites in a single screen. You can click through to see extra information or configure the sensitivity of each alert. ## Stop worrying, start monitoring Start a no-strings-attached 10-day free trial. You're all set in less than a minute. (No credit card needed.) Not convinced yet? Need help? Get in touch via . ### Let’s get technical (if you’re into that) You don’t need to be computer savvy to set up our tool. But if you are, we’re happy to explain exactly how it works and how you can customize Oh Dear to your specific needs. ## Multi-location performance monitoring Monitor your website's speed from around the world Your website's performance varies dramatically depending on where your visitors are located. A site that loads quickly in New York might be painfully slow in Tokyo or São Paulo. Oh Dear monitors your website's performance from **multiple geographic locations worldwide**, giving you a complete picture of how your global audience experiences your site. Identify regional performance bottlenecks, optimize your CDN configuration, and ensure a fast experience for users no matter where they are in the world. ## Monitor your API's performance You can monitor websites and API's using Oh Dear. For API monitoring, you can configure **additional payloads to monitor individual API endpoints**. ## Really into the nitty gritty details? Want to get into the nitty gritty details of our monitoring? Have a look at our documentation. ## Frequently asked questions ### What does Oh Dear's performance monitoring measure? It measures how long your pages take to respond, broken down into the phases that matter: DNS lookup, TCP connection, TLS handshake, the time your server spends building the response, and the download. When a page slows down, you can see which phase is to blame. ### How often does Oh Dear check performance, and how long is the history kept? Performance checks run every 15 minutes, and we keep a full year of history. That's enough to catch a slow Friday-afternoon deploy and to show the trend over months, not just today. ### Will Oh Dear alert me when my site gets slow? Yes, in two ways. Set a hard threshold (for example, alert me when responses pass 3.5 seconds), and we'll also flag a sudden slowdown by comparing the last 15 minutes against your recent baseline. So you hear about a real regression, not the usual noise. ### Is this real-user monitoring (RUM)? No, and we'd rather be straight about that. Oh Dear runs synthetic checks from our own servers, so monitoring keeps working even when nobody's visiting. For browser-level scores like SEO, accessibility, and best practices, that's our separate [Lighthouse monitoring](https://ohdear.app/features/lighthouse-seo-monitoring). ### Why does my site's response time matter? Because slow pages cost sales and rankings. A site that takes a few seconds longer to respond loses visitors before it even finishes loading. Watching response time means you fix the slowdown before it shows up in your conversion numbers. [See all other FAQ items →](https://ohdear.app/docs/faq) ## Start monitoring instantly Start a no-strings-attached 10-day free trial. You're all set in less than a minute. (No credit card needed.) Not convinced yet? Need help? Get in touch via .