diff --git a/JetStream.css b/JetStream.css
index c04d205f..3e50c2e7 100644
--- a/JetStream.css
+++ b/JetStream.css
@@ -304,6 +304,9 @@ a.button {
 .benchmark h3 {
     color:  rgb(183, 183, 183);
 }
+.benchmark.grouped .benchmark-name {
+    font-style: italic;
+}
 
 .benchmark-running h4, .benchmark-running .result, .benchmark-running label {
     color: #86D9FF;
diff --git a/JetStreamDriver.js b/JetStreamDriver.js
index 76cf9861..ee3fb5ec 100644
--- a/JetStreamDriver.js
+++ b/JetStreamDriver.js
@@ -221,9 +221,8 @@ class Driver {
         this.isReady = false;
         this.isDone = false;
         this.errors = [];
-        // Make benchmark list unique and sort it.
-        this.benchmarks = Array.from(new Set(benchmarks));
-        this.benchmarks.sort((a, b) => a.plan.name.toLowerCase() < b.plan.name.toLowerCase() ? 1 : -1);
+        this.benchmarks = this.setupBenchmarks(benchmarks)
+        this.scoreGroups = this.setupScoreGroups();
         assert(this.benchmarks.length, "No benchmarks selected");
         // TODO: Cleanup / remove / merge `blobDataCache` and `loadCache` vs.
         // the global `fileLoader` cache.
@@ -235,6 +234,28 @@ class Driver {
         this.counter.failedPreloadResources = 0;
     }
 
+    setupBenchmarks(benchmarks) {
+        // Make benchmark list unique and sort it.
+        benchmarks = Array.from(new Set(benchmarks));
+        benchmarks.sort((a, b) => a.plan.name.toLowerCase() < b.plan.name.toLowerCase() ? 1 : -1);
+        return benchmarks;
+    }
+
+    setupScoreGroups() {
+        const groups = new Map();
+        for (const benchmark of benchmarks) {
+            const scoreGroupName = benchmark.plan.scoreGroup ?? benchmark.name;
+            let scoreGroup = groups.get(scoreGroupName);
+            if (!scoreGroup) {
+                scoreGroup = [];
+                groups.set(scoreGroupName, scoreGroup); 
+            }
+            scoreGroup.push(benchmark);
+        }
+        return  Array.from(groups.entries()).map(
+                ([groupName, benchmarks]) => new ScoreGroup(groupName, benchmarks));
+    }
+
     async start() {
         let statusElement = false;
         let summaryElement = false;
@@ -284,22 +305,22 @@ class Driver {
         }
 
         const allScores = [];
-        for (const benchmark of this.benchmarks) {
-            const score = benchmark.score;
-            assert(score > 0, `Invalid ${benchmark.name} score: ${score}`);
+        for (const scoreGroup of this.scoreGroups) {
+            const score = scoreGroup.score;
+            assert(score > 0, `Invalid ${scoreGroup.name} score: ${score}`);
             allScores.push(score);
         }
 
         categoryScores = new Map;
-        for (const benchmark of this.benchmarks) {
-            for (let category of Object.keys(benchmark.subScores()))
+        for (const scoreGroup of this.scoreGroups) {
+            for (let category of Object.keys(scoreGroup.subScores()))
                 categoryScores.set(category, []);
         }
 
-        for (const benchmark of this.benchmarks) {
-            for (let [category, value] of Object.entries(benchmark.subScores())) {
+        for (const scoreGroup of this.scoreGroups) {
+            for (let [category, value] of Object.entries(scoreGroup.subScores())) {
                 const arr = categoryScores.get(category);
-                assert(value > 0, `Invalid ${benchmark.name} ${category} score: ${value}`);
+                assert(value > 0, `Invalid ${scoreGroup.name} ${category} score: ${value}`);
                 arr.push(value);
             }
         }
@@ -343,11 +364,14 @@ class Driver {
 
             const scoreIds = benchmark.scoreIdentifiers();
             const overallScoreId = scoreIds.pop();
+            let classes = "benchmark"
+            let isGroupedBenchmark =benchmark.scoreGroup.size > 1
+            if (isGroupedBenchmark)
+                classes += " grouped";
 
             if (isInBrowser) {
-                text +=
-                    `<div class="benchmark" id="benchmark-${benchmark.name}">
-                    <h3 class="benchmark-name"><a href="in-depth.html#${benchmark.name}">${benchmark.name}</a></h3>
+                text += `<div class="${classes}" id="benchmark-${benchmark.name}">
+                    <h3 class="benchmark-name"><a href="in-depth.html#${benchmark.name}">${benchmark.name}${isGroupedBenchmark ? " *":""}</a></h3>
                     <h4 class="score" id="${overallScoreId}">___</h4><p>`;
                 for (let i = 0; i < scoreIds.length; i++) {
                     const scoreId = scoreIds[i];
@@ -603,6 +627,37 @@ class Scripts {
     }
 }
 
+class ScoreGroup {
+    constructor(name, benchmarks) {
+        this.name = name;
+        this.benchmarks = benchmarks;
+        benchmarks.forEach(benchmark => benchmark.scoreGroup = this);
+    }
+
+    get size() {
+        return this.benchmarks.length;
+    }
+
+    add(benchmark) {
+        assert(!this.benchmarks.has(benchmark));
+        this.benchmarks.add(benchmark);
+    }
+
+    get score() {
+        return geomeanScore(this.benchmarks.map(each => each.score));
+    }
+
+    subScores() {
+        const allSubScores = this.benchmarks.map(each => each.subScores());
+        const subScores = { __proto__: null};
+        for (const name of Object.keys(allSubScores[0])) {
+            subScores[name] = geomeanScore(allSubScores.map(each => each[name]));
+        }
+        return subScores;
+    }
+}
+
+
 class ShellScripts extends Scripts {
     run() {
         let globalObject;
@@ -693,6 +748,7 @@ class Benchmark {
         this.scripts = null;
         this.preloads = null;
         this._state = BenchmarkState.READY;
+        this.scoreGroup = undefined;
     }
 
     processTags(rawTags) {
@@ -2387,6 +2443,7 @@ const SUNSPIDER_TESTS = [
     "string-unpack-code",
     "tagcloud",
 ];
+
 for (const test of SUNSPIDER_TESTS) {
     BENCHMARKS.push(new DefaultBenchmark({
         name: `${test}-SP`,
@@ -2394,9 +2451,11 @@ for (const test of SUNSPIDER_TESTS) {
             `./SunSpider/${test}.js`
         ],
         tags: ["Default", "SunSpider"],
+        scoreGroup: "SunSpider",
     }));
 }
 
+
 // WTB (Web Tooling Benchmark) tests
 const WTB_TESTS = [
     "acorn",