Is that 4sec delay something introduce in the pi 4 or 5? At least one guy got the 3 to boot to a Qt app in 2.8 seconds: https://www.furkantokac.com/rpi3-fast-boot-less-than-2-secon...
replyI've seen it with a 3 as well. That method, among other things, loses USB keyboard and mouse support. I haven't gone down that extreme a path yet...
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