diff --git a/.gitignore b/.gitignore
index 90157b1b..c8b09693 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 /node_modules
-.DS_Store
\ No newline at end of file
+.DS_Store
+/runs-2020-zstd
+/runs-zstd
\ No newline at end of file
diff --git a/index.js b/index.js
index f16c2170..cb0d4d7e 100644
--- a/index.js
+++ b/index.js
@@ -51,9 +51,8 @@ async function process_chunks (path) {
         const scored_chunk = process_raw_results(chunk_run)
         if (!result.run_info) {
             const raw_run_info = scored_chunk.run_info
-            const matches = raw_run_info
-                .browser_version.match(/^Servo ([0-9.]+-[a-f0-9]+)?(-dirty)?$/)
-            const browser_version = matches.length === 3 ? matches[1] : 'Unknown'
+            const matches = raw_run_info?.browser_version?.match(/^Servo ([0-9.]+-[a-f0-9]+)?(-dirty)?$/)
+            const browser_version = matches?.length === 3 ? matches[1] : 'Unknown'
             result.run_info = Object.assign(raw_run_info, { browser_version })
         }
         delete scored_chunk.run_info
@@ -67,6 +66,23 @@ async function add_run (runs_dir, chunks_dir, date) {
     await write_compressed(`./${runs_dir}/${date}.xz`, new_run)
 }
 
+async function score_single_run (chunks_dir, print_filter) {
+    const run = await process_chunks(chunks_dir)
+    const test_to_areas = focus_areas_map(run)
+    const { area_keys } = get_focus_areas()
+    const score = score_run(run, run, test_to_areas, print_filter)
+    const row = [
+        ['revision', run.run_info.revision.substring(0, 9)],
+        ['browser version', run.run_info.browser_version]
+    ]
+
+    for (const area of area_keys) {
+        row.push([area, score[area]])
+    }
+
+    return row
+}
+
 async function recalc_scores (runs_dir) {
     console.log(`Calculating scores for ${runs_dir} directory...`)
 
@@ -81,10 +97,12 @@ async function recalc_scores (runs_dir) {
     const { area_keys } = get_focus_areas()
     for (const [i, r] of all_runs.entries()) {
         const [date] = r.split('.')
+        const start = Date.now()
         console.log(`Reading run ${runs_dir}/${r} (${i}/${run_count})`)
         const run = await read_compressed(`./${runs_dir}/${r}`)
+        const start_score = Date.now()
         console.log(`Calculating score for run ${runs_dir}/${r} (${i}/${run_count})`)
-        const score = score_run(run, new_run, test_to_areas)
+        const score = score_run(run, new_run, test_to_areas, () => false)
         const row = [
             date,
             run.run_info.revision.substring(0, 9),
@@ -95,6 +113,13 @@ async function recalc_scores (runs_dir) {
             row.push(score[area])
         }
         scores.push(row)
+
+        const end = Date.now()
+        const read_time = start_score - start
+        const score_time = end - start_score
+        const total_time = end - start
+
+        console.log(`Done in ${total_time}ms (read in ${read_time}ms; scored in ${score_time}ms).`)
     }
 
     return scores
@@ -102,10 +127,22 @@ async function recalc_scores (runs_dir) {
 
 async function main () {
     const mode = process.argv[2]
-    if (!['--add', '--recalc'].includes(mode)) {
+    if (!['--add', '--recalc', '--score'].includes(mode)) {
         throw new Error(`invalid mode specified: ${mode}`)
     }
 
+    if (mode === '--score') {
+        const input_dir = process.argv[3]
+
+        let filterStr = undefined
+        if (process.argv[4] === '--filter') {
+            filterStr = process.argv[5]
+        }
+        const result = await score_single_run(input_dir, filterStr ? name => name.includes(filterStr) : () => true)
+        console.log(result)
+        return
+    }
+
     if (mode === '--add') {
         const chunks = process.argv[3]
         const date = process.argv[4]
diff --git a/package-lock.json b/package-lock.json
index 6c802952..c943e54e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "version": "1.0.0",
       "license": "MPL-2.0",
       "dependencies": {
+        "chalk": "^5.3.0",
         "lzma-native": "^8.0.6"
       },
       "devDependencies": {
@@ -446,33 +447,17 @@
       }
     },
     "node_modules/chalk": {
-      "version": "4.1.2",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
-      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
-      "dev": true,
-      "dependencies": {
-        "ansi-styles": "^4.1.0",
-        "supports-color": "^7.1.0"
-      },
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-5.3.0.tgz",
+      "integrity": "sha512-dLitG79d+GV1Nb/VYcCDFivJeK1hiukt9QjRNVOsUtTy1rR1YJsmpGGTZ3qJos+uw7WmWF4wUwBd9jxjocFC2w==",
+      "license": "MIT",
       "engines": {
-        "node": ">=10"
+        "node": "^12.17.0 || ^14.13 || >=16.0.0"
       },
       "funding": {
         "url": "https://github.com/chalk/chalk?sponsor=1"
       }
     },
-    "node_modules/chalk/node_modules/supports-color": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
-      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
-      "dev": true,
-      "dependencies": {
-        "has-flag": "^4.0.0"
-      },
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/chokidar": {
       "version": "3.5.3",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.5.3.tgz",
@@ -1126,6 +1111,23 @@
         "concat-map": "0.0.1"
       }
     },
+    "node_modules/eslint/node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
     "node_modules/eslint/node_modules/glob-parent": {
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-6.0.2.tgz",
@@ -1150,6 +1152,19 @@
         "node": "*"
       }
     },
+    "node_modules/eslint/node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/espree": {
       "version": "9.4.1",
       "resolved": "https://registry.npmjs.org/espree/-/espree-9.4.1.tgz",
@@ -1676,6 +1691,36 @@
         "node": ">=12"
       }
     },
+    "node_modules/http-server/node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/http-server/node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/iconv-lite": {
       "version": "0.6.3",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
@@ -2137,6 +2182,36 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/log-symbols/node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/log-symbols/node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/lru-cache": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
@@ -3521,25 +3596,9 @@
       "dev": true
     },
     "chalk": {
-      "version": "4.1.2",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
-      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
-      "dev": true,
-      "requires": {
-        "ansi-styles": "^4.1.0",
-        "supports-color": "^7.1.0"
-      },
-      "dependencies": {
-        "supports-color": {
-          "version": "7.2.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
-          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
-          "dev": true,
-          "requires": {
-            "has-flag": "^4.0.0"
-          }
-        }
-      }
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-5.3.0.tgz",
+      "integrity": "sha512-dLitG79d+GV1Nb/VYcCDFivJeK1hiukt9QjRNVOsUtTy1rR1YJsmpGGTZ3qJos+uw7WmWF4wUwBd9jxjocFC2w=="
     },
     "chokidar": {
       "version": "3.5.3",
@@ -3807,6 +3866,16 @@
             "concat-map": "0.0.1"
           }
         },
+        "chalk": {
+          "version": "4.1.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+          "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
+        },
         "glob-parent": {
           "version": "6.0.2",
           "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-6.0.2.tgz",
@@ -3824,6 +3893,15 @@
           "requires": {
             "brace-expansion": "^1.1.7"
           }
+        },
+        "supports-color": {
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^4.0.0"
+          }
         }
       }
     },
@@ -4427,6 +4505,27 @@
         "secure-compare": "3.0.1",
         "union": "~0.5.0",
         "url-join": "^4.0.1"
+      },
+      "dependencies": {
+        "chalk": {
+          "version": "4.1.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+          "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
+        },
+        "supports-color": {
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^4.0.0"
+          }
+        }
       }
     },
     "iconv-lite": {
@@ -4749,6 +4848,27 @@
       "requires": {
         "chalk": "^4.1.0",
         "is-unicode-supported": "^0.1.0"
+      },
+      "dependencies": {
+        "chalk": {
+          "version": "4.1.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+          "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
+        },
+        "supports-color": {
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^4.0.0"
+          }
+        }
       }
     },
     "lru-cache": {
diff --git a/package.json b/package.json
index 9bfca181..91a8e02e 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
     "mocha": "^10.2.0"
   },
   "dependencies": {
+    "chalk": "^5.3.0",
     "lzma-native": "^8.0.6"
   }
 }
diff --git a/process-wpt-results.js b/process-wpt-results.js
index 9ee69749..3bbec5ff 100644
--- a/process-wpt-results.js
+++ b/process-wpt-results.js
@@ -1,4 +1,5 @@
 import assert from 'node:assert/strict'
+import chalk from 'chalk';
 
 function is_object (val) {
     return (
@@ -189,7 +190,7 @@ export function get_focus_areas () {
     return { area_keys, area_names }
 }
 
-export function score_run (run, against_run, focus_areas_map) {
+export function score_run (run, against_run, focus_areas_map, print_filter) {
     const scores = {}
     for (const area of Object.keys(FOCUS_AREAS)) {
         scores[area] = {
@@ -198,7 +199,10 @@ export function score_run (run, against_run, focus_areas_map) {
         }
     }
 
-    for (const [test, { subtests }] of Object.entries(against_run.test_scores)) {
+    let testNames = Object.keys(against_run.test_scores);
+    testNames.sort();
+    for (const test of testNames) {
+        const { subtests } = against_run.test_scores[test];
         const areas = focus_areas_map[test]
 
         for (const area of areas) {
@@ -215,17 +219,33 @@ export function score_run (run, against_run, focus_areas_map) {
             for (const area of areas) {
                 scores[area].total_score += run_test.score
             }
+            if (print_filter(test)) {
+                const passes = run_test.score == 1;
+                if (passes) {
+                    console.log(chalk.green(`PASS ${test}`))
+                } else {
+                    console.log(chalk.red(`FAIL ${test}`))
+                }
+            }
         } else {
-            let test_score = 0
+            let passed_test_count = 0
             for (const subtest of subtest_names) {
                 if (Object.hasOwn(run_test.subtests, subtest)) {
-                    test_score += run_test.subtests[subtest].score
+                    passed_test_count += run_test.subtests[subtest].score
                 }
             }
-            test_score /= subtest_names.length
+            const test_score = passed_test_count / subtest_names.length
             for (const area of areas) {
                 scores[area].total_score += test_score
             }
+            if (print_filter(test)) {
+                const passes = test_score == 1;
+                if (passes) {
+                    console.log(chalk.green(`PASS ${test} (${passed_test_count}/${subtest_names.length})`))
+                } else {
+                    console.log(chalk.red(`FAIL ${test} (${passed_test_count}/${subtest_names.length})`))
+                }
+            }
         }
     }