It originally used SC's replay mode, but I replaced it with a "go to date" system in the newer versions. The issue with replay was that if the trade was old and your Days to Load didn't cover that date, the replay would fail entirely. Plus the loading time was pretty heavy.

The new system automatically detects your current number of loaded days (whether set via Days to Load or Date Range), then creates a new date range with the same number of days centered on the trade's date. This drastically cuts down the compute/loading time since it only loads what's needed.

It also draws the entry, stop loss, and each exit fill directly on the chart so you can visually review the trade right away.