The Initial Thread Race

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Since now all techn. questions should go to the forum here is mine:

The start of an indicator or an EA starts a thread race of various things. Especially if one uses OOP the setup of all the instances of the classes took quite a while - that's my experience!

In order to start the request of the needed historical data as early as possible, so that they are downloaded while the setup of the EA or the indicator is executed I would like to do e.g.:

int OnInit() {
   MqlRates r[];
   CopyRates(_Symbol, _Period,                                       0, TerminalInfoInteger(TERMINAL_MAXBARS)+1, r);
   CopyRates(_Symbol, _Period,   TerminalInfoInteger(TERMINAL_MAXBARS), TerminalInfoInteger(TERMINAL_MAXBARS)+1, r);
   CopyRates(_Symbol, PERIOD_M1,                                     0, TerminalInfoInteger(TERMINAL_MAXBARS)+1, r);
   CopyRates(_Symbol, PERIOD_M1, TerminalInfoInteger(TERMINAL_MAXBARS), TerminalInfoInteger(TERMINAL_MAXBARS)+1, r);
   ...
}
My question: will the call of CopyRates(..) interfere with each other or will that create independent threads that request and download their data?
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