Strategy tester timeframe

[Forexmadesimple]

When using strategy tester on say H1, it initially uses lower time frames as shown just above the progress bar - for example it states, "collecting M1", then "collecting M15".  Can someone explain that please. 

[Lorentzos Roussos]

Forexmadesimple:
When using strategy tester on say H1, it initially uses lower time frames as shown just above the progress bar - for example it states, "collecting M1", then "collecting M15".  Can someone explain that please. 

It reads the lowest available timeframe bars to simulate ticks as accurately as it can (since it has no access to historical tick data like MT5)

[Forexmadesimple]

Lorentzos Roussos:

It reads the lowest available timeframe bars to simulate ticks as accurately as it can (since it has no access to historical tick data like MT5)

Thank you