it depends on what the algo is doing and the trade volume that's been processed through (more to the algo itself IMO).
I'd cut as much dependency as possible.
ps wikipedia co-founder Larry Sanger runs his blog straight from a server in his house...
did some experiments with it lately, hope this helps if someone got here via google
Yes, historicalData will be called 100 times.
as for historicalDataUpdate, it will be called multiple times(whenever it supposed to be).
e.g. within 5 secs interval, a partial 5 sec bar will continue updating...