Lag is the reason moving averages exist. Smoothness buys confirmation at the cost of timing. Traders who treat lag as a bug to eliminate often end up with lines that hug price so tightly they fire on every tremor.
In the Strategy Lab we ask each table to compare an aggressive pair against a slower pair on the same twenty-session sample. The aggressive pair usually shows more crosses and more scratched exits. The slower pair shows fewer, later entries and, for many participants, calmer evenings.
Neither result is universally better. The point is to choose the lag you can live with when Hong Kong volatility expands around policy announcements or index rebalancing days.
Foundations Workshop graduates often leave surprised that we praise a late but clean cross. That praise is intentional. A late cross that matches your risk notes is more valuable than an early cross you abandon under pressure.
If you are rewriting periods solely to reduce lag, pause and run the twenty-session pencil exercise before you change anything live.