diff --git a/dev/bench/data.js b/dev/bench/data.js
new file mode 100644
index 0000000..f6575eb
--- /dev/null
+++ b/dev/bench/data.js
@@ -0,0 +1,38 @@
+window.BENCHMARK_DATA = {
+  "lastUpdate": 1610911194899,
+  "repoUrl": "https://github.com/jimeh/envctl",
+  "entries": {
+    "Benchmark": [
+      {
+        "commit": {
+          "author": {
+            "email": "contact@jimeh.me",
+            "name": "Jim Myhrberg",
+            "username": "jimeh"
+          },
+          "committer": {
+            "email": "noreply@github.com",
+            "name": "GitHub",
+            "username": "web-flow"
+          },
+          "distinct": true,
+          "id": "07807b2007579be58d4da3d96f88662aef1219ad",
+          "message": "Merge pull request #1 from jimeh/github-actions\n\nci(github): add basic GitHub Actions CI tasks",
+          "timestamp": "2021-01-17T19:19:25Z",
+          "tree_id": "7f2de284af1a6fa38775b97fa3c8de68d3f18c1a",
+          "url": "https://github.com/jimeh/envctl/commit/07807b2007579be58d4da3d96f88662aef1219ad"
+        },
+        "date": 1610911194339,
+        "tool": "go",
+        "benches": [
+          {
+            "name": "Benchmark_parseEnviron_2",
+            "value": 4637,
+            "unit": "ns/op",
+            "extra": "252384 times"
+          }
+        ]
+      }
+    ]
+  }
+}
\ No newline at end of file
diff --git a/dev/bench/index.html b/dev/bench/index.html
new file mode 100644
index 0000000..b391125
--- /dev/null
+++ b/dev/bench/index.html
@@ -0,0 +1,275 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1, user-scalable=yes" />
+    <style>
+      html {
+        font-family: BlinkMacSystemFont,-apple-system,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Fira Sans","Droid Sans","Helvetica Neue",Helvetica,Arial,sans-serif;
+        -webkit-font-smoothing: antialiased;
+        background-color: #fff;
+        font-size: 16px;
+      }
+      body {
+        color: #4a4a4a;
+        margin: 8px;
+        font-size: 1em;
+        font-weight: 400;
+      }
+      header {
+        margin-bottom: 8px;
+        display: flex;
+        flex-direction: column;
+      }
+      main {
+        width: 100%;
+        display: flex;
+        flex-direction: column;
+      }
+      a {
+        color: #3273dc;
+        cursor: pointer;
+        text-decoration: none;
+      }
+      a:hover {
+        color: #000;
+      }
+      button {
+        color: #fff;
+        background-color: #3298dc;
+        border-color: transparent;
+        cursor: pointer;
+        text-align: center;
+      }
+      button:hover {
+        background-color: #2793da;
+        flex: none;
+      }
+      .spacer {
+        flex: auto;
+      }
+      .small {
+        font-size: 0.75rem;
+      }
+      footer {
+        margin-top: 16px;
+        display: flex;
+        align-items: center;
+      }
+      .header-label {
+        margin-right: 4px;
+      }
+      .benchmark-set {
+        margin: 8px 0;
+        width: 100%;
+        display: flex;
+        flex-direction: column;
+      }
+      .benchmark-title {
+        font-size: 3rem;
+        font-weight: 600;
+        word-break: break-word;
+        text-align: center;
+      }
+      .benchmark-graphs {
+        display: flex;
+        flex-direction: row;
+        justify-content: space-around;
+        align-items: center;
+        flex-wrap: wrap;
+        width: 100%;
+      }
+      .benchmark-chart {
+        max-width: 1000px;
+      }
+    </style>
+    <title>Benchmarks</title>
+  </head>
+
+  <body>
+    <header id="header">
+      <div class="header-item">
+        <strong class="header-label">Last Update:</strong>
+        <span id="last-update"></span>
+      </div>
+      <div class="header-item">
+        <strong class="header-label">Repository:</strong>
+        <a id="repository-link" rel="noopener"></a>
+      </div>
+    </header>
+    <main id="main"></main>
+    <footer>
+      <button id="dl-button">Download data as JSON</button>
+      <div class="spacer"></div>
+      <div class="small">Powered by <a rel="noopener" href="https://github.com/marketplace/actions/continuous-benchmark">github-action-benchmark</a></div>
+    </footer>
+
+    <script src="https://cdn.jsdelivr.net/npm/chart.js@2.9.2/dist/Chart.min.js"></script>
+    <script src="data.js"></script>
+    <script id="main-script">
+      'use strict';
+      (function() {
+        // Colors from https://github.com/github/linguist/blob/master/lib/linguist/languages.yml
+        const toolColors = {
+          cargo: '#dea584',
+          go: '#00add8',
+          benchmarkjs: '#f1e05a',
+          pytest: '#3572a5',
+          googlecpp: '#f34b7d',
+          catch2: '#f34b7d',
+          _: '#333333'
+        };
+
+        function init() {
+          function collectBenchesPerTestCase(entries) {
+            const map = new Map();
+            for (const entry of entries) {
+              const {commit, date, tool, benches} = entry;
+              for (const bench of benches) {
+                const result = { commit, date, tool, bench };
+                const arr = map.get(bench.name);
+                if (arr === undefined) {
+                  map.set(bench.name, [result]);
+                } else {
+                  arr.push(result);
+                }
+              }
+            }
+            return map;
+          }
+
+          const data = window.BENCHMARK_DATA;
+
+          // Render header
+          document.getElementById('last-update').textContent = new Date(data.lastUpdate).toString();
+          const repoLink = document.getElementById('repository-link');
+          repoLink.href = data.repoUrl;
+          repoLink.textContent = data.repoUrl;
+
+          // Render footer
+          document.getElementById('dl-button').onclick = () => {
+            const dataUrl = 'data:,' + JSON.stringify(data, null, 2);
+            const a = document.createElement('a');
+            a.href = dataUrl;
+            a.download = 'benchmark_data.json';
+            a.click();
+          };
+
+          // Prepare data points for charts
+          return Object.keys(data.entries).map(name => ({
+            name,
+            dataSet: collectBenchesPerTestCase(data.entries[name]),
+          }));
+        }
+
+        function renderAllChars(dataSets) {
+
+          function renderGraph(parent, name, dataset) {
+            const canvas = document.createElement('canvas');
+            canvas.className = 'benchmark-chart';
+            parent.appendChild(canvas);
+
+            const color = toolColors[dataset.length > 0 ? dataset[0].tool : '_'];
+            const data = {
+              labels: dataset.map(d => d.commit.id.slice(0, 7)),
+              datasets: [
+                {
+                  label: name,
+                  data: dataset.map(d => d.bench.value),
+                  borderColor: color,
+                  backgroundColor: color + '60', // Add alpha for #rrggbbaa
+                }
+              ],
+            };
+            const options = {
+              scales: {
+                xAxes: [
+                  {
+                    scaleLabel: {
+                      display: true,
+                      labelString: 'commit',
+                    },
+                  }
+                ],
+                yAxes: [
+                  {
+                    scaleLabel: {
+                      display: true,
+                      labelString: dataset.length > 0 ? dataset[0].bench.unit : '',
+                    },
+                    ticks: {
+                      beginAtZero: true,
+                    }
+                  }
+                ],
+              },
+              tooltips: {
+                callbacks: {
+                  afterTitle: items => {
+                    const {index} = items[0];
+                    const data = dataset[index];
+                    return '\n' + data.commit.message + '\n\n' + data.commit.timestamp + ' committed by @' + data.commit.committer.username + '\n';
+                  },
+                  label: item => {
+                    let label = item.value;
+                    const { range, unit } = dataset[item.index].bench;
+                    label += ' ' + unit;
+                    if (range) {
+                      label += ' (' + range + ')';
+                    }
+                    return label;
+                  },
+                  afterLabel: item => {
+                    const { extra } = dataset[item.index].bench;
+                    return extra ? '\n' + extra : '';
+                  }
+                }
+              },
+              onClick: (_mouseEvent, activeElems) => {
+                if (activeElems.length === 0) {
+                  return;
+                }
+                // XXX: Undocumented. How can we know the index?
+                const index = activeElems[0]._index;
+                const url = dataset[index].commit.url;
+                window.open(url, '_blank');
+              },
+            };
+
+            new Chart(canvas, {
+              type: 'line',
+              data,
+              options,
+            });
+          }
+
+          function renderBenchSet(name, benchSet, main) {
+            const setElem = document.createElement('div');
+            setElem.className = 'benchmark-set';
+            main.appendChild(setElem);
+
+            const nameElem = document.createElement('h1');
+            nameElem.className = 'benchmark-title';
+            nameElem.textContent = name;
+            setElem.appendChild(nameElem);
+
+            const graphsElem = document.createElement('div');
+            graphsElem.className = 'benchmark-graphs';
+            setElem.appendChild(graphsElem);
+
+            for (const [benchName, benches] of benchSet.entries()) {
+              renderGraph(graphsElem, benchName, benches)
+            }
+          }
+
+          const main = document.getElementById('main');
+          for (const {name, dataSet} of dataSets) {
+            renderBenchSet(name, dataSet, main);
+          }
+        }
+
+        renderAllChars(init()); // Start
+      })();
+    </script>
+  </body>
+</html>
