How is performance calculated?

Where can I see performance data?

You can view the performance details in your Oh Dear dashboard where you will find a breakdown of the last hour, day, week etc.

What is a sudden change in performance?

We look at the difference between the average response time in the past two hours vs average response time in past 15 minutes. Any change faster or slower than the Site performance change notification percentage defined in your site performance settings (e.g. 50%) will trigger an alert.

Your Site performance threshold is your maximum allowable site speed (in milliseconds) before your site is considered slow and alert is sent.

Why is my site slow?

The transferring of data is almost always the fastest piece, unless it's about MB's of data - in which case, bandwidth becomes an issue, so most time in a request is spent setting up TCP, SSL & waiting for the server.

The results you see could indicate issues in a number of different areas of your application such as server health, slow database queries or missed caches.

Your hosting provider could have also changed firewall/WAF or routing which would up increase TLS times, if packets are dropped & have to be resent.

There could also be large-scale outages from hosting companies affecting different regions.

Oh Dear can be configured to perform uptime checks from a location of your choice and will always perform downtime verification from a secondary location.

Keep up to date

You can follow our Twitter and status page to stay up to date with any monitoring issues we may have or any wider-events occurring that would impact performance metrics around the world.

Was this page helpful to you? Feel free to reach out via or on Twitter via @OhDearApp if you have any other questions. We'd love to help!