Top Web Performance Testing Articles

Apica´s Web Performance Blog is your source for tips, trends and tools for optimizing your web performance. Track current web performance metrics and benchmarks and new technology in web performance testing.

How much have cloud failures cost us?

Last week, the International Working Group on Cloud Computing Resiliency (IWGCR) released a study that calculated the impact of cloud outages on the economy. The research, which tracked downtime in the market since 2007, had some startling results: In the past five years, we’ve seen 568 hours of downtime at 13 well-known cloud services, which had an economic impact of more than $71.7 million dollars.

This also impacted the average time for unavailability in cloud services, bringing it to 7.5 hours per year. However, there is good news: Even with those numbers, the availability rate is still at 99.9 percent. But it’s obvious that gone are the days of the five nines: 99.999 percent uptime, seen as standard in the TelcoData world.

Needless to say, it’s time to take a look at what could be causing these issues, and what we can be doing to fix them. Below is my take on the problem. I’ve listed what I think are the main causes below, along with a corresponding list of what we can consciously be doing to prevent downtime.


  • Complications within the cloud stack and internal applications
  •  Hardware failure
  •  DDoS
  •  Human error
  •  Improper change control process
  •  Switch and routing issues
  •  Lack of proper proactive DR testing and capacity planning

Best practices:

  • Test for cloud outages and develop a contingency and disaster recovery plan
  • Implement a high-availability strategy to build out redundancies — i.e. Test between availability zones, cloud environments, and data centers
  • Employ regular performance testing to ensure that performance remains consistent

Have any more questions about preventing outages? Feel free to reach out to me in an email.


New Call-to-action