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# Use a proper PDF Viewer!!!
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Before looking at the reports on this page make sure you are using a proper PDF viewer, like the newest version of Adobe Acrobat Reader. As of the time of writing (10.10.2021) many PDF viewers, especially those bundled with web browsers (Firefox, Chrome, Edge etc.) interpolate pixels linearly to screen resolution when displaying raster images (think PNG or JPG). This is a suboptimal behaviour for our display of colour-indexed images in our reports as it makes them difficult to interpret. Viewers that use nearest-neighbour interpolation respect the image they are meant to display correctly, which causes the reports here to be displayed correctly.
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# Why Warm-Up Messages Should Be Used
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Here is an example of why warm-up messages are important. This example show a UCP test on JUSUF. In it we see atrociously poor timings along the right half of the anti-diagonal. This is because these connections are tested first and only when the first message is sent are the UCP workers primed, as a result the first time the connection is tested the corresponding connection and worker need to be initialized. This effect averages out if more messages are averaged over or if the message size is larger. Effectively the right-side of the anti-diagonal shows the latency in finishing worker initialization and setting up connections.
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