diff --git a/miner/miner.go b/miner/miner.go
index 62bec5b55..18bfa535f 100644
--- a/miner/miner.go
+++ b/miner/miner.go
@@ -419,7 +419,7 @@ func (m *Miner) GetBestMiningCandidate(ctx context.Context) (*MiningBase, error)
 //  1.
 func (m *Miner) mineOne(ctx context.Context, base *MiningBase) (minedBlock *types.BlockMsg, err error) {
 	log.Debugw("attempting to mine a block", "tipset", types.LogCids(base.TipSet.Cids()))
-	start := build.Clock.Now()
+	tStart := build.Clock.Now()
 
 	round := base.TipSet.Height() + base.NullRounds + 1
 
@@ -439,13 +439,13 @@ func (m *Miner) mineOne(ctx context.Context, base *MiningBase) (minedBlock *type
 			}
 		}
 
-		isLate := uint64(start.Unix()) > (base.TipSet.MinTimestamp() + uint64(base.NullRounds*builtin.EpochDurationSeconds) + build.PropagationDelaySecs)
+		isLate := uint64(tStart.Unix()) > (base.TipSet.MinTimestamp() + uint64(base.NullRounds*builtin.EpochDurationSeconds) + build.PropagationDelaySecs)
 
 		logStruct := []interface{}{
-			"tookMilliseconds", (build.Clock.Now().UnixNano() - start.UnixNano()) / 1_000_000,
+			"tookMilliseconds", (build.Clock.Now().UnixNano() - tStart.UnixNano()) / 1_000_000,
 			"forRound", int64(round),
 			"baseEpoch", int64(base.TipSet.Height()),
-			"baseDeltaSeconds", uint64(start.Unix()) - base.TipSet.MinTimestamp(),
+			"baseDeltaSeconds", uint64(tStart.Unix()) - base.TipSet.MinTimestamp(),
 			"nullRounds", int64(base.NullRounds),
 			"lateStart", isLate,
 			"beaconEpoch", rbase.Round,
@@ -480,16 +480,10 @@ func (m *Miner) mineOne(ctx context.Context, base *MiningBase) (minedBlock *type
 		return nil, nil
 	}
 
-	tMBI := build.Clock.Now()
-
-	beaconPrev := mbi.PrevBeaconEntry
-
-	tDrand := build.Clock.Now()
-	bvals := mbi.BeaconEntries
-
 	tPowercheck := build.Clock.Now()
 
-	rbase = beaconPrev
+	bvals := mbi.BeaconEntries
+	rbase = mbi.PrevBeaconEntry
 	if len(bvals) > 0 {
 		rbase = bvals[len(bvals)-1]
 	}
@@ -561,9 +555,7 @@ func (m *Miner) mineOne(ctx context.Context, base *MiningBase) (minedBlock *type
 	log.Infow("mined new block", "cid", minedBlock.Cid(), "height", int64(minedBlock.Header.Height), "miner", minedBlock.Header.Miner, "parents", parentMiners, "parentTipset", base.TipSet.Key().String(), "took", dur)
 	if dur > time.Second*time.Duration(build.BlockDelaySecs) {
 		log.Warnw("CAUTION: block production took longer than the block delay. Your computer may not be fast enough to keep up",
-			"tMinerBaseInfo ", tMBI.Sub(start),
-			"tDrand ", tDrand.Sub(tMBI),
-			"tPowercheck ", tPowercheck.Sub(tDrand),
+			"tPowercheck ", tPowercheck.Sub(tStart),
 			"tTicket ", tTicket.Sub(tPowercheck),
 			"tSeed ", tSeed.Sub(tTicket),
 			"tProof ", tProof.Sub(tSeed),