diff --git a/dashboard/app/build/perf.go b/dashboard/app/build/perf.go
index bce67156..9ec717cd 100644
--- a/dashboard/app/build/perf.go
+++ b/dashboard/app/build/perf.go
@@ -114,14 +114,12 @@ func (rc *PerfResultCache) Next(commitNum int) (*PerfResult, error) {
 			}
 		}
 	}
-	//rc.c.Errorf("PerfResultCache.Next: num=%v next=%v", commitNum, next)
 	if next != -1 {
 		return rc.results[next], nil
 	}
 	// Fetch next result from datastore.
 	res := new(PerfResult)
 	_, err := rc.iter.Next(res)
-	//rc.c.Errorf("PerfResultCache.Next: fetched %v %+v", err, res)
 	if err == datastore.Done {
 		return nil, nil
 	}
@@ -218,25 +216,28 @@ func significantPerfChanges(pc *PerfConfig, builder string, prevRes, res *PerfRe
 		}
 	}
 	// Then, strip non-repeatable changes (flakes).
-	// The hypothesis is that a real change must show up with at least
-	// 2 different values of GOMAXPROCS.
+	// The hypothesis is that a real change must show up with the majority of GOMAXPROCS values.
+	majority := len(pc.ProcList(builder))/2 + 1
 	cnt := make(map[string]int)
 	for _, ch := range changes {
 		b, _ := splitBench(ch.bench)
 		name := b + "|" + ch.metric
-		inc := 1
 		if ch.diff < 0 {
-			inc = -1
+			name += "--"
 		}
-		cnt[name] = cnt[name] + inc
+		cnt[name] = cnt[name] + 1
 	}
 	for i := 0; i < len(changes); i++ {
 		ch := changes[i]
 		b, _ := splitBench(ch.bench)
 		name := b + "|" + ch.metric
-		if n := cnt[name]; n <= -2 || n >= 2 {
+		if cnt[name] >= majority {
 			continue
 		}
+		if cnt[name+"--"] >= majority {
+			continue
+		}
+		// Remove flake.
 		last := len(changes) - 1
 		changes[i] = changes[last]
 		changes = changes[:last]
diff --git a/dashboard/app/build/perf_learn.go b/dashboard/app/build/perf_learn.go
index bd308ea8..32b8fdf1 100644
--- a/dashboard/app/build/perf_learn.go
+++ b/dashboard/app/build/perf_learn.go
@@ -23,7 +23,7 @@ func init() {
 
 const (
 	learnPercentile       = 0.95
-	learnSignalMultiplier = 1.2
+	learnSignalMultiplier = 1.1
 	learnMinSignal        = 0.5
 )