report(metrics): display metrics in seconds

lighthouse-core/audits/bootup-time.js

@@ -176,7 +176,8 @@ class BootupTime extends Audit {
     return {
       score,
       rawValue: totalBootupTime,
-      displayValue: totalBootupTime > 0 ? str_(i18n.UIStrings.ms, {timeInMs: totalBootupTime}) : '',
+      displayValue: totalBootupTime > 0 ?
+        str_(i18n.UIStrings.seconds, {timeInMs: totalBootupTime}) : '',
       details,
     };
   }

lighthouse-core/audits/mainthread-work-breakdown.js

@@ -121,7 +121,7 @@ class MainThreadWorkBreakdown extends Audit {
     return {
       score,
       rawValue: totalExecutionTime,
-      displayValue: str_(i18n.UIStrings.ms, {timeInMs: totalExecutionTime}),
+      displayValue: str_(i18n.UIStrings.seconds, {timeInMs: totalExecutionTime}),
       details: tableDetails,
     };
   }

lighthouse-core/audits/metrics/first-contentful-paint.js

@@ -63,7 +63,7 @@ class FirstContentfulPaint extends Audit {
         context.options.scoreMedian
       ),
       rawValue: metricResult.timing,
-      displayValue: str_(i18n.UIStrings.ms, {timeInMs: metricResult.timing}),
+      displayValue: str_(i18n.UIStrings.seconds, {timeInMs: metricResult.timing}),
     };
   }
 }

lighthouse-core/audits/metrics/first-cpu-idle.js

@@ -67,7 +67,7 @@ class FirstCPUIdle extends Audit {
         context.options.scoreMedian
       ),
       rawValue: metricResult.timing,
-      displayValue: str_(i18n.UIStrings.ms, {timeInMs: metricResult.timing}),
+      displayValue: str_(i18n.UIStrings.seconds, {timeInMs: metricResult.timing}),
     };
   }
 }

lighthouse-core/audits/metrics/first-meaningful-paint.js

@@ -66,7 +66,7 @@ class FirstMeaningfulPaint extends Audit {
         context.options.scoreMedian
       ),
       rawValue: metricResult.timing,
-      displayValue: str_(i18n.UIStrings.ms, {timeInMs: metricResult.timing}),
+      displayValue: str_(i18n.UIStrings.seconds, {timeInMs: metricResult.timing}),
     };
   }
 }

lighthouse-core/audits/metrics/interactive.js

@@ -78,7 +78,7 @@ class InteractiveMetric extends Audit {
         context.options.scoreMedian
       ),
       rawValue: timeInMs,
-      displayValue: str_(i18n.UIStrings.ms, {timeInMs}),
+      displayValue: str_(i18n.UIStrings.seconds, {timeInMs}),
       extendedInfo: {
         value: extendedInfo,
       },

lighthouse-core/audits/metrics/speed-index.js

@@ -65,7 +65,7 @@ class SpeedIndex extends Audit {
         context.options.scoreMedian
       ),
       rawValue: metricResult.timing,
-      displayValue: str_(i18n.UIStrings.ms, {timeInMs: metricResult.timing}),
+      displayValue: str_(i18n.UIStrings.seconds, {timeInMs: metricResult.timing}),
     };
   }
 }

lighthouse-core/lib/i18n.js

@@ -36,8 +36,10 @@ const MESSAGE_INSTANCE_ID_REGEX = /(.* \| .*) # (\d+)$/;
 
 
 const UIStrings = {
-/** Used to show the duration in milliseconds that something lasted. The `{timeInMs}` placeholder will be replaced with the time duration, shown in milliseconds (e.g. 63 ms) */
+  /** Used to show the duration in milliseconds that something lasted. The `{timeInMs}` placeholder will be replaced with the time duration, shown in milliseconds (e.g. 63 ms) */
   ms: '{timeInMs, number, milliseconds}\xa0ms',
+  /** Used to show the duration in seconds that something lasted. The {timeInMs} placeholder will be replaced with the time duration, shown in seconds (e.g. 5.2 s) */
+  seconds: '{timeInMs, number, seconds}\xa0s',
   /** Label shown per-audit to show how many bytes smaller the page could be if the user implemented the suggestions. The `{wastedBytes}` placeholder will be replaced with the number of bytes, shown in kilobytes (e.g. 148 KB) */
   displayValueByteSavings: 'Potential savings of {wastedBytes, number, bytes}\xa0KB',
   /** Label shown per-audit to show how many milliseconds faster the page load could be if the user implemented the suggestions. The `{wastedMs}` placeholder will be replaced with the time duration, shown in milliseconds (e.g. 140 ms) */
@@ -64,6 +66,11 @@ const formats = {
     milliseconds: {
       maximumFractionDigits: 0,
     },
+    seconds: {
+      // Force the seconds to the tenths place for limited output and ease of scanning
+      minimumFractionDigits: 1,
+      maximumFractionDigits: 1,
+    },
   },
 };
 
@@ -109,6 +116,12 @@ function _preprocessMessageValues(icuMessage, values) {
     // @ts-ignore - el.id is always defined when el.format is defined
     .forEach(el => (clonedValues[el.id] = Math.round(clonedValues[el.id] / 10) * 10));
 
+  // Convert all seconds to the correct unit
+  parsed.elements
+    .filter(el => el.format && el.format.style === 'seconds' && el.id === 'timeInMs')
+    // @ts-ignore - el.id is always defined when el.format is defined
+    .forEach(el => (clonedValues[el.id] = Math.round(clonedValues[el.id] / 100) / 10));
+
   // Replace all the bytes with KB
   parsed.elements
     .filter(el => el.format && el.format.style === 'bytes')

lighthouse-core/lib/locales/en-US.json

@@ -407,6 +407,10 @@
     "message": "{timeInMs, number, milliseconds} ms",
     "description": "Used to show the duration in milliseconds that something lasted. The `{timeInMs}` placeholder will be replaced with the time duration, shown in milliseconds (e.g. 63 ms)"
   },
+  "lighthouse-core/lib/i18n.js | seconds": {
+    "message": "{timeInMs, number, seconds} s",
+    "description": "Used to show the duration in seconds that something lasted. The {timeInMs} placeholder will be replaced with the time duration, shown in seconds (e.g. 5.2 s)"
+  },
   "lighthouse-core/report/html/renderer/util.js | auditGroupExpandTooltip": {
     "message": "Show audits",
     "description": "The tooltip text on an expandable chevron icon. Clicking the icon expands a section to reveal a list of audit results that was hidden by default."

lighthouse-core/test/audits/metrics/first-meaningful-paint-test.js

@@ -27,7 +27,7 @@ describe('Performance: first-meaningful-paint audit', () => {
 
     assert.equal(fmpResult.score, 1);
     assert.equal(fmpResult.rawValue, 783.328);
-    expect(fmpResult.displayValue).toBeDisplayString('780\xa0ms');
+    expect(fmpResult.displayValue).toBeDisplayString('0.8\xa0s');
   });
 
   it('computes FMP correctly for simulated', async () => {

lighthouse-core/test/audits/metrics/interactive-test.js

@@ -34,7 +34,7 @@ describe('Performance: interactive audit', () => {
     return Interactive.audit(artifacts, {options, settings}).then(output => {
       assert.equal(output.score, 1);
       assert.equal(Math.round(output.rawValue), 1582);
-      expect(output.displayValue).toBeDisplayString('1,580\xa0ms');
+      expect(output.displayValue).toBeDisplayString('1.6\xa0s');
     });
   });
 
@@ -52,7 +52,7 @@ describe('Performance: interactive audit', () => {
     return Interactive.audit(artifacts, {options, settings}).then(output => {
       assert.equal(output.score, 0.97);
       assert.equal(Math.round(output.rawValue), 2712);
-      expect(output.displayValue).toBeDisplayString('2,710\xa0ms');
+      expect(output.displayValue).toBeDisplayString('2.7\xa0s');
     });
   });
 });

lighthouse-core/test/results/sample_v2.json

@@ -84,7 +84,7 @@
       "score": 0.51,
       "scoreDisplayMode": "numeric",
       "rawValue": 3969.135,
-      "displayValue": "3,970 ms"
+      "displayValue": "4.0 s"
     },
     "first-meaningful-paint": {
       "id": "first-meaningful-paint",
@@ -93,7 +93,7 @@
       "score": 0.51,
       "scoreDisplayMode": "numeric",
       "rawValue": 3969.136,
-      "displayValue": "3,970 ms"
+      "displayValue": "4.0 s"
     },
     "load-fast-enough-for-pwa": {
       "id": "load-fast-enough-for-pwa",
@@ -110,7 +110,7 @@
       "score": 0.74,
       "scoreDisplayMode": "numeric",
       "rawValue": 4417,
-      "displayValue": "4,420 ms"
+      "displayValue": "4.4 s"
     },
     "screenshot-thumbnails": {
       "id": "screenshot-thumbnails",
@@ -270,7 +270,7 @@
       "score": 0.72,
       "scoreDisplayMode": "numeric",
       "rawValue": 4927.278,
-      "displayValue": "4,930 ms"
+      "displayValue": "4.9 s"
     },
     "interactive": {
       "id": "interactive",
@@ -279,7 +279,7 @@
       "score": 0.78,
       "scoreDisplayMode": "numeric",
       "rawValue": 4927.278,
-      "displayValue": "4,930 ms"
+      "displayValue": "4.9 s"
     },
     "user-timings": {
       "id": "user-timings",
@@ -646,7 +646,7 @@
       "score": 0.96,
       "scoreDisplayMode": "numeric",
       "rawValue": 1548.5690000000002,
-      "displayValue": "1,550 ms",
+      "displayValue": "1.5 s",
       "details": {
         "type": "table",
         "headings": [
@@ -708,7 +708,7 @@
       "score": 0.92,
       "scoreDisplayMode": "numeric",
       "rawValue": 1150.932,
-      "displayValue": "1,150 ms",
+      "displayValue": "1.2 s",
       "details": {
         "type": "table",
         "headings": [
@@ -3429,7 +3429,7 @@
       "lighthouse-core/audits/metrics/first-contentful-paint.js | description": [
         "audits[first-contentful-paint].description"
       ],
-      "lighthouse-core/lib/i18n.js | ms": [
+      "lighthouse-core/lib/i18n.js | seconds": [
         {
           "values": {
             "timeInMs": 3969.135
@@ -3448,12 +3448,6 @@
           },
           "path": "audits[speed-index].displayValue"
         },
-        {
-          "values": {
-            "timeInMs": 16
-          },
-          "path": "audits[estimated-input-latency].displayValue"
-        },
         {
           "values": {
             "timeInMs": 4927.278
@@ -3497,6 +3491,14 @@
       "lighthouse-core/audits/metrics/estimated-input-latency.js | description": [
         "audits[estimated-input-latency].description"
       ],
+      "lighthouse-core/lib/i18n.js | ms": [
+        {
+          "values": {
+            "timeInMs": 16
+          },
+          "path": "audits[estimated-input-latency].displayValue"
+        }
+      ],
       "lighthouse-core/audits/time-to-first-byte.js | title": [
         "audits[time-to-first-byte].title"
       ],