diff --git a/src/simulator/crates/mc-mapgen/src/lib.rs b/src/simulator/crates/mc-mapgen/src/lib.rs
index 7712b119..42db7144 100644
--- a/src/simulator/crates/mc-mapgen/src/lib.rs
+++ b/src/simulator/crates/mc-mapgen/src/lib.rs
@@ -1290,13 +1290,18 @@ mod tests {
 
     #[test]
     fn test_map_gen_standard_speed() {
-        // Standard map must complete in reasonable time (performance regression guard).
+        // Coarse order-of-magnitude regression guard. The bound is deliberately
+        // generous: on the DO test fleet (s-8vcpu-16gb) standard mapgen runs
+        // ~465-608ms, and under the full parallel test pool it drifts higher, so
+        // a tight 500ms wall-clock assertion flaked (negative headroom). A real
+        // regression here would be an accidental O(n^2) — seconds, not ms — which
+        // 2500ms still catches without flaking on host/CI load variance.
         let gen = MapGenerator::new("{}");
         let start = std::time::Instant::now();
         let grid = gen.generate(999, "standard");
         let elapsed = start.elapsed();
         assert_eq!(grid.tiles.len(), (80 * 52) as usize);
-        assert!(elapsed.as_millis() < 500, "standard map gen took {}ms — too slow", elapsed.as_millis());
+        assert!(elapsed.as_millis() < 2500, "standard map gen took {}ms — too slow", elapsed.as_millis());
     }
 
     // ── guarantee_iron_ore_near_starts tests ─────────────────────────────────