diff --git a/sim/options.go b/sim/options.go
index 76d5c4ef..58f19dbc 100644
--- a/sim/options.go
+++ b/sim/options.go
@@ -16,9 +16,8 @@ const (
 )
 
 var (
-	defaultBaseChain    gpbft.ECChain
-	defaultBeacon       = []byte("beacon")
-	defaultLatencyModel latency.Model
+	defaultBaseChain gpbft.ECChain
+	defaultBeacon    = []byte("beacon")
 )
 
 func init() {
@@ -27,10 +26,6 @@ func init() {
 	if err != nil {
 		panic("failed to instantiate default simulation base chain")
 	}
-	defaultLatencyModel, err = latency.NewLogNormal(time.Now().UnixMilli(), time.Second*5)
-	if err != nil {
-		panic("failed to instantiate default simulation latency model")
-	}
 }
 
 type Option func(*options) error
@@ -69,7 +64,7 @@ func newOptions(o ...Option) (*options, error) {
 		opts.honestCount = defaultHonestCount
 	}
 	if opts.latencyModel == nil {
-		opts.latencyModel = defaultLatencyModel
+		opts.latencyModel = latency.None
 	}
 	if opts.signingBacked == nil {
 		opts.signingBacked = signing.NewFakeBackend()
diff --git a/sim/sim.go b/sim/sim.go
index d316a91d..4e8f3271 100644
--- a/sim/sim.go
+++ b/sim/sim.go
@@ -122,7 +122,7 @@ func (s *Simulation) Run(instanceCount uint64, maxRounds uint64) error {
 		if s.decisions.err != nil {
 			return fmt.Errorf("error in decision: %w", s.decisions.err)
 		}
-		if s.participants[0].CurrentRound() >= maxRounds {
+		if s.getMaxRound() > maxRounds {
 			return fmt.Errorf("reached maximum number of %d rounds", maxRounds)
 		}
 		// Verify the current instance as soon as it completes.
@@ -181,3 +181,14 @@ func (s *Simulation) GetInstance(i int) *ECInstance {
 	}
 	return s.ec.Instances[i]
 }
+
+func (s *Simulation) getMaxRound() uint64 {
+	var maxRound uint64
+	for _, participant := range s.participants {
+		currentRound := participant.CurrentRound()
+		if currentRound > maxRound {
+			maxRound = currentRound
+		}
+	}
+	return maxRound
+}