diff --git a/lighthouse-core/gather/computed/metrics/lantern-metric.js b/lighthouse-core/gather/computed/metrics/lantern-metric.js
index 591919319ea5..b6e575e4d1eb 100644
--- a/lighthouse-core/gather/computed/metrics/lantern-metric.js
+++ b/lighthouse-core/gather/computed/metrics/lantern-metric.js
@@ -82,11 +82,13 @@ class LanternMetricArtifact extends ComputedArtifact {
     const optimisticGraph = this.getOptimisticGraph(graph, traceOfTab);
     const pessimisticGraph = this.getPessimisticGraph(graph, traceOfTab);
 
-    const optimisticSimulation = simulator.simulate(optimisticGraph, {flexibleOrdering: true});
+    const optimisticSimulation = simulator.simulate(optimisticGraph);
+    const optimisticFlexSimulation = simulator.simulate(optimisticGraph, {flexibleOrdering: true});
     const pessimisticSimulation = simulator.simulate(pessimisticGraph);
 
     const optimisticEstimate = this.getEstimateFromSimulation(
-      optimisticSimulation,
+      optimisticSimulation.timeInMs < optimisticFlexSimulation.timeInMs ?
+        optimisticSimulation : optimisticFlexSimulation,
       Object.assign({}, extras, {optimistic: true})
     );
 
diff --git a/lighthouse-core/test/audits/first-meaningful-paint-test.js b/lighthouse-core/test/audits/first-meaningful-paint-test.js
index b7368f308bce..b261c390aee0 100644
--- a/lighthouse-core/test/audits/first-meaningful-paint-test.js
+++ b/lighthouse-core/test/audits/first-meaningful-paint-test.js
@@ -39,8 +39,8 @@ describe('Performance: first-meaningful-paint audit', () => {
     const context = {options, settings: {throttlingMethod: 'simulate'}};
     const fmpResult = await FMPAudit.audit(artifacts, context);
 
-    assert.equal(fmpResult.score, 0.92);
-    assert.equal(Util.formatDisplayValue(fmpResult.displayValue), '2,850\xa0ms');
-    assert.equal(Math.round(fmpResult.rawValue), 2851);
+    assert.equal(fmpResult.score, 0.95);
+    assert.equal(Util.formatDisplayValue(fmpResult.displayValue), '2,030\xa0ms');
+    assert.equal(Math.round(fmpResult.rawValue), 2029);
   });
 });
diff --git a/lighthouse-core/test/audits/load-fast-enough-for-pwa-test.js b/lighthouse-core/test/audits/load-fast-enough-for-pwa-test.js
index 3abd6e3edfdb..e35b5991842a 100644
--- a/lighthouse-core/test/audits/load-fast-enough-for-pwa-test.js
+++ b/lighthouse-core/test/audits/load-fast-enough-for-pwa-test.js
@@ -67,6 +67,6 @@ describe('PWA: load-fast-enough-for-pwa audit', () => {
 
     const settings = {throttlingMethod: 'provided', throttling: {rttMs: 40, throughput: 100000}};
     const result = await FastPWAAudit.audit(artifacts, {settings});
-    assert.equal(Math.round(result.rawValue), 5308);
+    assert.equal(Math.round(result.rawValue), 4309);
   });
 });
diff --git a/lighthouse-core/test/audits/metrics-test.js b/lighthouse-core/test/audits/metrics-test.js
index 494db1b80cc5..2596f238d814 100644
--- a/lighthouse-core/test/audits/metrics-test.js
+++ b/lighthouse-core/test/audits/metrics-test.js
@@ -29,15 +29,15 @@ describe('Performance: metrics', () => {
     const result = await Audit.audit(artifacts, {settings});
 
     assert.deepStrictEqual(result.details.items[0], {
-      firstContentfulPaint: 2038,
+      firstContentfulPaint: 1272,
       firstContentfulPaintTs: undefined,
-      firstMeaningfulPaint: 2851,
+      firstMeaningfulPaint: 2029,
       firstMeaningfulPaintTs: undefined,
-      firstCPUIdle: 5308,
+      firstCPUIdle: 4309,
       firstCPUIdleTs: undefined,
-      interactive: 5308,
+      interactive: 4309,
       interactiveTs: undefined,
-      speedIndex: 2063,
+      speedIndex: 1501,
       speedIndexTs: undefined,
       estimatedInputLatency: 104,
       estimatedInputLatencyTs: undefined,
diff --git a/lighthouse-core/test/audits/predictive-perf-test.js b/lighthouse-core/test/audits/predictive-perf-test.js
index 86c2c2a37d28..9896a17258c3 100644
--- a/lighthouse-core/test/audits/predictive-perf-test.js
+++ b/lighthouse-core/test/audits/predictive-perf-test.js
@@ -25,18 +25,18 @@ describe('Performance: predictive performance audit', () => {
     }, Runner.instantiateComputedArtifacts());
 
     return PredictivePerf.audit(artifacts).then(output => {
-      assert.equal(output.score, 0.79);
-      assert.equal(Math.round(output.rawValue), 5308);
-      assert.equal(output.displayValue, '5,310\xa0ms');
+      assert.equal(output.score, 0.86);
+      assert.equal(Math.round(output.rawValue), 4309);
+      assert.equal(output.displayValue, '4,310\xa0ms');
 
       const valueOf = name => Math.round(output.extendedInfo.value[name]);
-      assert.equal(valueOf('roughEstimateOfFCP'), 2038);
+      assert.equal(valueOf('roughEstimateOfFCP'), 1272);
       assert.equal(valueOf('optimisticFCP'), 611);
       assert.equal(valueOf('pessimisticFCP'), 611);
-      assert.equal(valueOf('roughEstimateOfFMP'), 2851);
+      assert.equal(valueOf('roughEstimateOfFMP'), 2029);
       assert.equal(valueOf('optimisticFMP'), 911);
       assert.equal(valueOf('pessimisticFMP'), 1198);
-      assert.equal(valueOf('roughEstimateOfTTI'), 5308);
+      assert.equal(valueOf('roughEstimateOfTTI'), 4309);
       assert.equal(valueOf('optimisticTTI'), 2451);
       assert.equal(valueOf('pessimisticTTI'), 2752);
     });
diff --git a/lighthouse-core/test/gather/computed/metrics/first-contentful-paint-test.js b/lighthouse-core/test/gather/computed/metrics/first-contentful-paint-test.js
index 40e8e266ab6a..6d9d05ff2b84 100644
--- a/lighthouse-core/test/gather/computed/metrics/first-contentful-paint-test.js
+++ b/lighthouse-core/test/gather/computed/metrics/first-contentful-paint-test.js
@@ -19,7 +19,7 @@ describe('Metrics: FCP', () => {
     const settings = {throttlingMethod: 'simulate'};
     const result = await artifacts.requestFirstContentfulPaint({trace, devtoolsLog, settings});
 
-    assert.equal(Math.round(result.timing), 2038);
+    assert.equal(Math.round(result.timing), 1272);
     assert.equal(Math.round(result.optimisticEstimate.timeInMs), 611);
     assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 611);
     assert.equal(result.optimisticEstimate.nodeTimings.size, 2);
diff --git a/lighthouse-core/test/gather/computed/metrics/first-cpu-idle-test.js b/lighthouse-core/test/gather/computed/metrics/first-cpu-idle-test.js
index aafcb9daea3b..6a4307965565 100644
--- a/lighthouse-core/test/gather/computed/metrics/first-cpu-idle-test.js
+++ b/lighthouse-core/test/gather/computed/metrics/first-cpu-idle-test.js
@@ -63,7 +63,7 @@ describe('FirstInteractive computed artifact:', () => {
     const artifacts = Runner.instantiateComputedArtifacts();
     const result = await artifacts.requestFirstCPUIdle({trace, devtoolsLog, settings});
 
-    assert.equal(Math.round(result.timing), 5308);
+    assert.equal(Math.round(result.timing), 4309);
     assert.equal(Math.round(result.optimisticEstimate.timeInMs), 2451);
     assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 2752);
     assert.equal(result.optimisticEstimate.nodeTimings.size, 19);
diff --git a/lighthouse-core/test/gather/computed/metrics/first-meaningful-paint-test.js b/lighthouse-core/test/gather/computed/metrics/first-meaningful-paint-test.js
index 93a370951fdb..3fbdde59f72b 100644
--- a/lighthouse-core/test/gather/computed/metrics/first-meaningful-paint-test.js
+++ b/lighthouse-core/test/gather/computed/metrics/first-meaningful-paint-test.js
@@ -39,7 +39,7 @@ describe('Metrics: FMP', () => {
 
     const result = await artifacts.requestFirstMeaningfulPaint({trace, devtoolsLog, settings});
 
-    assert.equal(Math.round(result.timing), 2851);
+    assert.equal(Math.round(result.timing), 2029);
     assert.equal(Math.round(result.optimisticEstimate.timeInMs), 911);
     assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 1198);
     assert.equal(result.optimisticEstimate.nodeTimings.size, 4);
diff --git a/lighthouse-core/test/gather/computed/metrics/interactive-test.js b/lighthouse-core/test/gather/computed/metrics/interactive-test.js
index f24f24057907..50a53077837f 100644
--- a/lighthouse-core/test/gather/computed/metrics/interactive-test.js
+++ b/lighthouse-core/test/gather/computed/metrics/interactive-test.js
@@ -34,7 +34,7 @@ describe('Metrics: TTI', () => {
     const settings = {throttlingMethod: 'simulate'};
     const result = await artifacts.requestInteractive({trace, devtoolsLog, settings});
 
-    assert.equal(Math.round(result.timing), 5308);
+    assert.equal(Math.round(result.timing), 4309);
     assert.equal(Math.round(result.optimisticEstimate.timeInMs), 2451);
     assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 2752);
     assert.equal(result.optimisticEstimate.nodeTimings.size, 19);
diff --git a/lighthouse-core/test/gather/computed/metrics/lantern-first-contentful-paint-test.js b/lighthouse-core/test/gather/computed/metrics/lantern-first-contentful-paint-test.js
index ab067b6755ee..6911800366e6 100644
--- a/lighthouse-core/test/gather/computed/metrics/lantern-first-contentful-paint-test.js
+++ b/lighthouse-core/test/gather/computed/metrics/lantern-first-contentful-paint-test.js
@@ -18,7 +18,7 @@ describe('Metrics: Lantern FCP', () => {
     const result = await artifacts.requestLanternFirstContentfulPaint({trace, devtoolsLog,
       settings: {}});
 
-    assert.equal(Math.round(result.timing), 2038);
+    assert.equal(Math.round(result.timing), 1272);
     assert.equal(Math.round(result.optimisticEstimate.timeInMs), 611);
     assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 611);
     assert.equal(result.optimisticEstimate.nodeTimings.size, 2);
diff --git a/lighthouse-core/test/gather/computed/metrics/lantern-first-cpu-idle-test.js b/lighthouse-core/test/gather/computed/metrics/lantern-first-cpu-idle-test.js
index 9a501641d306..75a6840ba336 100644
--- a/lighthouse-core/test/gather/computed/metrics/lantern-first-cpu-idle-test.js
+++ b/lighthouse-core/test/gather/computed/metrics/lantern-first-cpu-idle-test.js
@@ -17,7 +17,7 @@ describe('Metrics: Lantern TTFCPUI', () => {
     const artifacts = Runner.instantiateComputedArtifacts();
     const result = await artifacts.requestLanternFirstCPUIdle({trace, devtoolsLog, settings: {}});
 
-    assert.equal(Math.round(result.timing), 5308);
+    assert.equal(Math.round(result.timing), 4309);
     assert.equal(Math.round(result.optimisticEstimate.timeInMs), 2451);
     assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 2752);
     assert.equal(result.optimisticEstimate.nodeTimings.size, 19);
diff --git a/lighthouse-core/test/gather/computed/metrics/lantern-first-meaningful-paint-test.js b/lighthouse-core/test/gather/computed/metrics/lantern-first-meaningful-paint-test.js
index 49d308971c44..fbd55770f761 100644
--- a/lighthouse-core/test/gather/computed/metrics/lantern-first-meaningful-paint-test.js
+++ b/lighthouse-core/test/gather/computed/metrics/lantern-first-meaningful-paint-test.js
@@ -18,7 +18,7 @@ describe('Metrics: Lantern FMP', () => {
     const result = await artifacts.requestLanternFirstMeaningfulPaint({trace, devtoolsLog,
       settings: {}});
 
-    assert.equal(Math.round(result.timing), 2851);
+    assert.equal(Math.round(result.timing), 2029);
     assert.equal(Math.round(result.optimisticEstimate.timeInMs), 911);
     assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 1198);
     assert.equal(result.optimisticEstimate.nodeTimings.size, 4);
diff --git a/lighthouse-core/test/gather/computed/metrics/lantern-interactive-test.js b/lighthouse-core/test/gather/computed/metrics/lantern-interactive-test.js
index 2bc007adf8a9..4dce4acb567d 100644
--- a/lighthouse-core/test/gather/computed/metrics/lantern-interactive-test.js
+++ b/lighthouse-core/test/gather/computed/metrics/lantern-interactive-test.js
@@ -18,7 +18,7 @@ describe('Metrics: Lantern TTI', () => {
     const result = await artifacts.requestLanternInteractive({trace, devtoolsLog,
       settings: {}});
 
-    assert.equal(Math.round(result.timing), 5308);
+    assert.equal(Math.round(result.timing), 4309);
     assert.equal(Math.round(result.optimisticEstimate.timeInMs), 2451);
     assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 2752);
     assert.equal(result.optimisticEstimate.nodeTimings.size, 19);
diff --git a/lighthouse-core/test/gather/computed/metrics/lantern-speed-index-test.js b/lighthouse-core/test/gather/computed/metrics/lantern-speed-index-test.js
index f3b5632b1226..5b8f1e554f65 100644
--- a/lighthouse-core/test/gather/computed/metrics/lantern-speed-index-test.js
+++ b/lighthouse-core/test/gather/computed/metrics/lantern-speed-index-test.js
@@ -17,8 +17,8 @@ describe('Metrics: Lantern Speed Index', () => {
     const artifacts = Runner.instantiateComputedArtifacts();
     const result = await artifacts.requestLanternSpeedIndex({trace, devtoolsLog, settings: {}});
 
-    assert.equal(Math.round(result.timing), 2063);
+    assert.equal(Math.round(result.timing), 1501);
     assert.equal(Math.round(result.optimisticEstimate.timeInMs), 605);
-    assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 2038);
+    assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 1392);
   });
 });
diff --git a/lighthouse-core/test/gather/computed/metrics/speed-index-test.js b/lighthouse-core/test/gather/computed/metrics/speed-index-test.js
index dfbe883eb912..eb0aefa90da3 100644
--- a/lighthouse-core/test/gather/computed/metrics/speed-index-test.js
+++ b/lighthouse-core/test/gather/computed/metrics/speed-index-test.js
@@ -19,9 +19,9 @@ describe('Metrics: Speed Index', () => {
     const settings = {throttlingMethod: 'simulate'};
     const result = await artifacts.requestSpeedIndex({trace, devtoolsLog, settings});
 
-    assert.equal(Math.round(result.timing), 2063);
+    assert.equal(Math.round(result.timing), 1501);
     assert.equal(Math.round(result.optimisticEstimate.timeInMs), 605);
-    assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 2038);
+    assert.equal(Math.round(result.pessimisticEstimate.timeInMs), 1392);
   });
 
   it('should compute an observed value', async () => {
diff --git a/lighthouse-core/test/results/sample_v2.json b/lighthouse-core/test/results/sample_v2.json
index f4ef9cbcbafb..20cb9648a7ba 100644
--- a/lighthouse-core/test/results/sample_v2.json
+++ b/lighthouse-core/test/results/sample_v2.json
@@ -2735,7 +2735,7 @@
           {
             "url": "http://localhost:10200/dobetterweb/dbw_partial_a.html?delay=200",
             "totalBytes": 736,
-            "wastedMs": 723
+            "wastedMs": 873
           },
           {
             "url": "http://localhost:10200/dobetterweb/dbw_tester.js",