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Some failures (like hidden dialog commit buttons) only occur on screens with low resolution. With VirtualBox guest extensions properly installed, you should be able to simply resize the VM window and the guest's virtual screen should automatically adjust. As a reference for size, screenshots from failed Jenkins build may be used; or just roughly 1000 x 700 px.

Throttle

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Magnolia

Other test failures are caused by racing conditions only surfacing on slow systems, where certain elements take longer to load than usual. For Linux (now OS X too), there's a command line tool called cpulimit to set an upper CPU time percentage limit for certain processes.

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