I demand that Chris Warren may or may not have written...
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It seems that the more timers you have the slower VDR (1.3.21) becomes. I normally get "max. latency time 2 seconds" in my syslog, however when I have 20 timers, I get "max. latency time 17 seconds". What's causing it to slow down so much?
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The attached patch (which is in my vdr package) should help.