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Load Impact
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Load Impact is a cloud-based service for load testing and website optimization. It generates traffic load by simulating users. Load Impact is a so-called freemium service in that it offers a free option as well as a premium option, where the latter gives access to more features. Apart from the service itself, Load Impact does open research on topics such as browser behavior and slashdotting. Main components Load Impact consists of two main parts, the load testing tool and the page analyzer. Load testing tool The load testing tool generates simulated user traffic to a website. Users can simulate virtual users who are trying to load the web pages at the same time. While simulating the traffic, the tool records how fast pages are loaded from the server. This lets users know how fast the site is (as experienced by a user) when it is being accessed by many users at the same time. Results are displayed in real time throughout the test process. The tool is cloud-based and provides on-demand load testing. It also features a session recorder that lets users browse the site like a regular user, while the actions are recorded. The recorded session can then be used when running load tests, to make the simulated clients behave just as how the user recorded it. There are three different types of load test: # Time in queue (grey) # DNS lookup time (orange) # Connection time (yellow) # Time to first byte (green) # Download time (blue) The page analyzer can emulate these browsers and indexing bots:<ref name="pageanalyzer" /> * Chrome (1,2,3,4) * Firefox (3,3.5) * Googlebot (2.1) * Internet Explorer (6,7,8) * MSNbot (1.1) * Opera (9.64) * Safari (3.2,4) * Yahoo! Slurp Popularity as a load test tool As of April 2013, Load Impact reported that more than 750,000 individual load tests had been carried out through its website. 
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