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Interesting post by Benjojo about measuring how the ping time to a host is split between the two packet directions. Made me think of a dumb hack that recognizes a host is being pinged and sends response packets for the later repeats before the request has arrived. According to wikipedia, the pattern is predictable. Just needs a guess for how much to send early without the response arriving before the request.
Today I wondered why #Firefox suddenly had become slow and laggy again. Turns out it tries to detect the use of accessibility tools and then disables Electrolysis (seperate rendering processes) for a week and goes back to it's old, laggy single-process model. I assume this was triggered by taking a screenshot with the Windows Snipping Tool in my case. Luckily, there is a preference to turn this detection off.