Trading US equities from overseas isn't primarily a time-zone problem — it's an infrastructure problem. The trader in Singapore using a retail mobile app is competing with institutional desks routing through DMA at the same moment, on the same tape, with better borrow access.

Global Weighted Order Flow Timing — SPY 1-min vol runs 2.66 bp/min at 09:30 (Europe still active), drops to 1.36 bp at 14:30 (no overseas), bounces to 1.70 bp into close. Session overlaps amplify US tape speed. Trade the overlap windows, sleep through the dead zone.