We can deduce nothing from the log. Of the 13 commands, significant delays between scrape actions were evident with 4 of them (3 of these in sequence). But there is no discernible pattern to when it is working instantly and when it isn't.
If the requests were timing out for some reason, that may show up in the History window but not the VC log. Did you notice any red error lines in the left-hand History window?
At any rate, it seems likely that James was correct earlier when he suggested that the problem is not within VC.
To eliminate variables, you should concentrate on stress-testing the Z-way controller software, without VoxCommando.
If the controller has its own logging, take a look there to see if commands are timing out. Or maybe you can see a pattern with z-wave devices that are far from the controller not always responding?
Sorry that we can't be more helpful.