Finder should show changes immediately except on certain external filesystems. It gets kernel events on directory and file changes (the same mechanism Spotlight

Finder should show changes immediately except on certain external filesystems. It gets kernel events on directory and file changes (the same mechanism Spotlight and Time Machine use). This bites me on fake FAT filesystems over USB for hardware development kits, and I usually just turn those features off. The heuristics there are often terrible, and I'd rather create a build system that writes a new image, instead of doing manual drag-and-drops.