Hi again and sorry to reply to myself ...
The problems that I had, i. e. - strange behaviour of the "next letter" timeout in searches via remote - displayed stuff on the squeezebox vanishing too quickly - wildly fluctuationg time with the daylight screensaver
were all caused by a glitch in the server's time source. A 'watch -n 1 -d ntptime', while crude, showed the same skewed results. Apparently most reasonably modern CPU have TSC capability, which basically means using the CPU's clock generator as an accurate time source. I had 'AMD 76x native power management' in my .config, which seems to change frequency on the fly without notifying the timers -> go figure.
The same could happen with any other kind of non-cpufreq throttling - if you don't want to disable it, disabling TSC altogether (kernel option + notsc boot option) works, but is not recommended.
C.
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