Noticed that most Z systems are 4 hour bars or more and 1 is hourly bars (i.e. swing-trading hold times). Has the team tried optimizing these (or other strategies) at smaller bars (1 / 5/ 10 minutes) and found the performance to be sub-optimal?

I would have imagined better performance and lower drawdowns at small bars (intraday hold times of 1-2 hours), but I wonder if most strategies don't perform well at small bars because the price action is very noisy and it's hard to discern any patterns (trends/mean/reversion/machine learning or other).

If anyone has any insights on what kinds of strategies work at small bars (if anything) and how well they perform relative to hourly+ bars, would be helpful.

thx
Kiran