diff --git a/chain/gen/gen.go b/chain/gen/gen.go
index b38f2c0df..6af8b9d4f 100644
--- a/chain/gen/gen.go
+++ b/chain/gen/gen.go
@@ -279,12 +279,12 @@ func (cg *ChainGen) NextTipSetFromMiners(base *types.TipSet, miners []address.Ad
 	}
 
 	fts := store.NewFullTipSet(blks)
-	fmt.Println("Made a block: ", fts.TipSet().Cids())
+	/*fmt.Println("Made a block: ", fts.TipSet().Cids())
 	if len(fts.TipSet().Cids()) > 1 {
 		for _, b := range blks {
 			fmt.Printf("block %s: %#v\n", b.Cid(), b.Header)
 		}
-	}
+	}*/
 
 	return &MinedTipSet{
 		TipSet:   fts,
diff --git a/lib/sectorbuilder/sectorbuilder_test.go b/lib/sectorbuilder/sectorbuilder_test.go
index ad2d8ebc2..819c52824 100644
--- a/lib/sectorbuilder/sectorbuilder_test.go
+++ b/lib/sectorbuilder/sectorbuilder_test.go
@@ -15,7 +15,9 @@ import (
 const sectorSize = 1024
 
 func TestSealAndVerify(t *testing.T) {
-	//t.Skip("this is slow")
+	t.Skip("this is slow")
+	//os.Setenv("BELLMAN_NO_GPU", "1")
+
 	build.SectorSizes = []uint64{sectorSize}
 
 	if err := build.GetParams(true); err != nil {
@@ -41,7 +43,7 @@ func TestSealAndVerify(t *testing.T) {
 		SectorSize: sectorSize,
 		Miner:      addr,
 
-		WorkerThreads: 1,
+		WorkerThreads: 2,
 
 		CacheDir:    cache,
 		SealedDir:   sealed,