Hi Manuel :D I prefer very long runs on symbols what I do in my strategy optimization, since the same strategy can behave differently in separate symbols or separate timeframes I stick to the most common symbols, my strategies are mostly played on H1 / H4 And so far looking for a good data provider since running tests will tell you that history data is below 80% I don't have that kind of data. My most recent strategy is well-tested upon only 4 of mentioned currencies and only XAUUSD from commodities. This is enough for me because on history my optimization so far gives me around 15% year by year. As Einstein said, compounding interest is the eighth wonder of the world. I basically do a quick step test with only 1000 sets of data combinations to test to see a sweet spot, and if the strategy is doing well in this particular symbol/pair. If no, skip, if yes continue to be more precise nearer the sweet spot ;) see if the test is not over-optimized and give it a try at different times and see equity curve if is not just luck and so on :P What I understand from your system conclusion. Try to give it another option of lot sizing. My strategies started with the static lot (silly), then I tried with lot sized by equity (better) then I started to make SL a % of an account balance. Long story short is all about the sizing, indices/commodities gave you a great move and can result in a great win. But having a stable strategy with tight SL with % of an account balance gives you the same on currencies. If only brokes out there would give us 1:100 like good old times:) What are the major currencies for 2019 Q2: Currencies: EUR/USD - 24% (of all transactions in forex) USD/JPY - 13% GBP/USD - 9.6% AUD/USD - 5.4% USD/CAD - 44% USD/CHF - 3 5% EUR/GBP - 2% NZD/CHF - %? (not in the survey but still considered as mayor) Most traded others: Commodities: WTI NATGAS XAUUSD SILVER COPPER Indicies: DJ30 SP500 DAX40 NIKKEI225 NASDAQ100 FTSE100 E50