diff --git a/chain/consensus/filcns/upgrades.go b/chain/consensus/filcns/upgrades.go
index 07184ec68..d3fb21412 100644
--- a/chain/consensus/filcns/upgrades.go
+++ b/chain/consensus/filcns/upgrades.go
@@ -197,9 +197,14 @@ func DefaultUpgradeSchedule() stmgr.UpgradeSchedule {
 		Migration: UpgradeActorsV9,
 		PreMigrations: []stmgr.PreMigration{{
 			PreMigration:    PreUpgradeActorsV9,
-			StartWithin:     180,
+			StartWithin:     240,
 			DontStartWithin: 60,
 			StopWithin:      5,
+		}, {
+			PreMigration:    PreUpgradeActorsV9,
+			StartWithin:     15,
+			DontStartWithin: 10,
+			StopWithin:      5,
 		}},
 		Expensive: true,
 	},
diff --git a/cmd/lotus-shed/migrations.go b/cmd/lotus-shed/migrations.go
index f00bad5a5..74d1999f0 100644
--- a/cmd/lotus-shed/migrations.go
+++ b/cmd/lotus-shed/migrations.go
@@ -115,7 +115,7 @@ var migrationsCmd = &cli.Command{
 			return err
 		}
 
-		ts1, err := cs.GetTipsetByHeight(ctx, blk.Height-180, migrationTs, false)
+		ts1, err := cs.GetTipsetByHeight(ctx, blk.Height-240, migrationTs, false)
 		if err != nil {
 			return err
 		}
@@ -127,30 +127,51 @@ var migrationsCmd = &cli.Command{
 			return err
 		}
 
-		fmt.Println("completed round 1, took ", time.Since(startTime))
+		preMigration1Time := time.Since(startTime)
+
+		ts2, err := cs.GetTipsetByHeight(ctx, blk.Height-15, migrationTs, false)
+		if err != nil {
+			return err
+		}
+
+		startTime = time.Now()
+
+		err = filcns.PreUpgradeActorsV9(ctx, sm, cache, ts2.ParentState(), ts2.Height()-1, ts2)
+		if err != nil {
+			return err
+		}
+
+		preMigration2Time := time.Since(startTime)
+
 		startTime = time.Now()
 
 		newCid1, err := filcns.UpgradeActorsV9(ctx, sm, cache, nil, blk.ParentStateRoot, blk.Height-1, migrationTs)
 		if err != nil {
 			return err
 		}
-		fmt.Println("completed round actual (with cache), took ", time.Since(startTime))
 
-		fmt.Println("new cid", newCid1)
+		cachedMigrationTime := time.Since(startTime)
+
+		startTime = time.Now()
 
 		newCid2, err := filcns.UpgradeActorsV9(ctx, sm, nv15.NewMemMigrationCache(), nil, blk.ParentStateRoot, blk.Height-1, migrationTs)
 		if err != nil {
 			return err
 		}
-		fmt.Println("completed round actual (without cache), took ", time.Since(startTime))
 
-		fmt.Println("new cid", newCid2)
+		uncachedMigrationTime := time.Since(startTime)
 
 		if newCid1 != newCid2 {
 			return xerrors.Errorf("got different results with and without the cache: %s, %s", newCid1,
 				newCid2)
 		}
 
+		fmt.Println("new cid", newCid2)
+		fmt.Println("completed premigration 1, took ", preMigration1Time)
+		fmt.Println("completed premigration 2, took ", preMigration2Time)
+		fmt.Println("completed round actual (with cache), took ", cachedMigrationTime)
+		fmt.Println("completed round actual (without cache), took ", uncachedMigrationTime)
+
 		err = checkStateInvariants(ctx, blk.ParentStateRoot, newCid1, bs)
 		if err != nil {
 			return err