diff --git a/.github/workflows/perf.yml b/.github/workflows/perf.yml
index 207d5949448e..2c5e817f4cee 100644
--- a/.github/workflows/perf.yml
+++ b/.github/workflows/perf.yml
@@ -98,6 +98,14 @@ jobs:
           build_with_profile head
           deactivate
 
+      # The vibe.d workload is pinned by dub.selections.json, so a cache hit
+      # keeps the package registry out of the loop on all but the first run.
+      - name: Cache vibe.d workload sources
+        uses: actions/cache@v4
+        with:
+          path: ~/.dub/packages
+          key: dub-${{ hashFiles('tools/perfrunner/workloads/vibed/dub.selections.json') }}
+
       - name: Measure
         run: |
           set -uexo pipefail
diff --git a/tools/perfrunner/.gitignore b/tools/perfrunner/.gitignore
index f89d9b4adda1..8cbf8f5bf3d5 100644
--- a/tools/perfrunner/.gitignore
+++ b/tools/perfrunner/.gitignore
@@ -5,3 +5,6 @@ perfrunner.exe
 *.o
 *.obj
 results.json
+
+# The workload's dependency pin has to be tracked, the repo root ignores it.
+!workloads/vibed/dub.selections.json
diff --git a/tools/perfrunner/source/app.d b/tools/perfrunner/source/app.d
index 98830374a4f6..8e2355f5a237 100644
--- a/tools/perfrunner/source/app.d
+++ b/tools/perfrunner/source/app.d
@@ -7,9 +7,16 @@ import std.stdio : stderr, writeln;
 
 import metrics : measure, initials;
 import report : MetricResult, render, Report;
+import vibed : describeFlags;
 
-// Initial workload: the one source file compile to measure DMD.
-enum workload = buildPath(__FILE_FULL_PATH__.dirName.dirName, "workloads", "hello.d");
+enum workloads = buildPath(__FILE_FULL_PATH__.dirName.dirName, "workloads");
+
+// The one source file compile to measure DMD.
+enum workload = buildPath(workloads, "hello.d");
+
+// Third-party workload: its sources are fetched by dub, the recipe is pinned in-repo.
+enum vibedDir = buildPath(workloads, "vibed");
+enum vibedRoot = buildPath(vibedDir, "source", "app.d");
 
 version (unittest) {} else
 int main(string[] args)
@@ -50,8 +57,11 @@ int main(string[] args)
     auto tmp = buildPath(tempDir, "perfrunner");
     mkdirRecurse(tmp);
 
-    auto base = measure(baseDmd, workload, basePhobos, tmp, "base");
-    auto head = measure(headDmd, workload, headPhobos, tmp, "head");
+    // Resolved once: both refs have to compile vibe.d with the same flags.
+    auto vibedFlags = describeFlags(vibedDir, baseDmd);
+
+    auto base = measure(baseDmd, workload, basePhobos, vibedRoot, vibedFlags, tmp, "base");
+    auto head = measure(headDmd, workload, headPhobos, vibedRoot, vibedFlags, tmp, "head");
 
     MetricResult[] metrics;
     foreach (def; initials)
diff --git a/tools/perfrunner/source/metrics.d b/tools/perfrunner/source/metrics.d
index f22cdcdf5690..9ff93d1dcb46 100644
--- a/tools/perfrunner/source/metrics.d
+++ b/tools/perfrunner/source/metrics.d
@@ -22,26 +22,34 @@ immutable MetricDef[] initials = [
     MetricDef("compile_hello_debug_instr",   "compile hello.d (instr)",    "count", "cachegrind"),
     MetricDef("compile_hello_release_instr", "compile hello.d -O (instr)", "count", "cachegrind"),
     MetricDef("compile_phobos_instr",        "compile Phobos (instr)",     "count", "cachegrind"),
+    MetricDef("compile_vibed_instr",         "compile vibe.d (instr)",     "count", "cachegrind"),
     MetricDef("dmd_binary_size",             "dmd binary size (stripped)", "bytes", "stat"),
     MetricDef("hello_binary_size",           "hello binary size",          "bytes", "stat"),
     MetricDef("hello_max_rss",               "peak RSS (compile hello.d)", "kb",    "time -v"),
     MetricDef("phobos_max_rss",              "peak RSS (compile Phobos)",  "kb",    "time -v"),
+    MetricDef("vibed_max_rss",               "peak RSS (compile vibe.d)",  "kb",    "time -v"),
 ];
 
 // Measure every metric for one dmd binary. `tag` ("base"/"head")
 // keeps the two runs' temp files apart
-long[string] measure(string dmd, string workload, string phobos, string tmp, string tag)
+long[string] measure(string dmd, string workload, string phobos,
+    string vibed, string[] vibedFlags, string tmp, string tag)
 {
     auto stdPackage = buildPath(phobos, "std", "package.d");
     auto phobosFlags = ["-i=std", "-preview=dip1000"];
+    // Unlike a dub build, which compiles one package per invocation, this pulls
+    // the whole vibe.d tree into a single compile.
+    auto vibeFlags = "-i" ~ vibedFlags;
     return [
         "compile_hello_debug_instr":   instructions(dmd, [], workload, tmp, tag ~ "-dbg"),
         "compile_hello_release_instr": instructions(dmd, ["-O", "-release"], workload, tmp, tag ~ "-rel"),
         "compile_phobos_instr":        instructions(dmd, phobosFlags, stdPackage, tmp, tag ~ "-phobos"),
+        "compile_vibed_instr":         instructions(dmd, vibeFlags, vibed, tmp, tag ~ "-vibed"),
         "dmd_binary_size":             strippedSize(dmd, buildPath(tmp, tag ~ "-dmd")),
         "hello_binary_size":           helloSize(dmd, workload, tmp, tag),
         "hello_max_rss":               maxRss(dmd, [], workload, tmp, tag),
         "phobos_max_rss":              maxRss(dmd, phobosFlags, stdPackage, tmp, tag ~ "-phobos"),
+        "vibed_max_rss":               maxRss(dmd, vibeFlags, vibed, tmp, tag ~ "-vibed"),
     ];
 }
 
diff --git a/tools/perfrunner/source/vibed.d b/tools/perfrunner/source/vibed.d
new file mode 100644
index 000000000000..51ef120b95ee
--- /dev/null
+++ b/tools/perfrunner/source/vibed.d
@@ -0,0 +1,58 @@
+module vibed;
+
+import std.process : execute;
+
+// The flags dub would pass to the compiler for the vibe.d workload: the
+// -version=Have_* set and the import paths of all pinned dependencies.
+// Called once, so base and head compile with an identical command line.
+string[] describeFlags(string dir, string dmd)
+{
+    auto r = execute(["dub", "describe", "--root=" ~ dir, "--compiler=" ~ dmd,
+        "--data=versions,import-paths,string-import-paths"]);
+    if (r.status != 0)
+        throw new Exception("dub describe failed:\n" ~ r.output);
+    return splitFlags(r.output);
+}
+
+// dub quotes any flag holding a space, so splitting on whitespace is not enough.
+string[] splitFlags(string output)
+{
+    string[] flags;
+    char[] flag;
+    bool quoted, started;
+
+    foreach (c; output)
+    {
+        if (c == '\'')
+            quoted = !quoted;
+        else if (!quoted && (c == ' ' || c == '\t' || c == '\n' || c == '\r'))
+        {
+            if (started)
+                flags ~= flag.idup;
+            flag.length = 0;
+            started = false;
+            continue;
+        }
+        else
+            flag ~= c;
+        started = true;
+    }
+
+    if (started)
+        flags ~= flag.idup;
+    return flags;
+}
+
+unittest
+{
+    auto sample = "-version=Have_vibe_d -version=EventcoreEpollDriver "
+        ~ "'-I/home/me/my dub/packages/vibe-d/0.10.3/vibe-d/source/' "
+        ~ "-I/home/me/.dub/packages/eventcore/0.9.39/eventcore/source/\n";
+
+    assert(splitFlags(sample) == [
+        "-version=Have_vibe_d",
+        "-version=EventcoreEpollDriver",
+        "-I/home/me/my dub/packages/vibe-d/0.10.3/vibe-d/source/",
+        "-I/home/me/.dub/packages/eventcore/0.9.39/eventcore/source/",
+    ]);
+}
diff --git a/tools/perfrunner/workloads/vibed/dub.json b/tools/perfrunner/workloads/vibed/dub.json
new file mode 100644
index 000000000000..6b5f1cb257fc
--- /dev/null
+++ b/tools/perfrunner/workloads/vibed/dub.json
@@ -0,0 +1,8 @@
+{
+	"name": "vibed-workload",
+	"description": "vibe.d compile workload for perfrunner",
+	"targetType": "executable",
+	"dependencies": {
+		"vibe-d": "0.10.3"
+	}
+}
diff --git a/tools/perfrunner/workloads/vibed/dub.selections.json b/tools/perfrunner/workloads/vibed/dub.selections.json
new file mode 100644
index 000000000000..cfaf2c7a6eb1
--- /dev/null
+++ b/tools/perfrunner/workloads/vibed/dub.selections.json
@@ -0,0 +1,21 @@
+{
+	"fileVersion": 1,
+	"versions": {
+		"diet-ng": "1.8.4",
+		"during": "0.3.0",
+		"eventcore": "0.9.39",
+		"mir-linux-kernel": "1.2.1",
+		"openssl": "3.4.0",
+		"openssl-static": "1.0.5+3.0.8",
+		"silly": "1.1.1",
+		"stdx-allocator": "2.77.5",
+		"taggedalgebraic": "1.0.1",
+		"vibe-container": "1.7.1",
+		"vibe-core": "2.14.0",
+		"vibe-d": "0.10.3",
+		"vibe-http": "1.5.1",
+		"vibe-inet": "1.3.1",
+		"vibe-serialization": "1.2.0",
+		"vibe-stream": "1.4.1"
+	}
+}
diff --git a/tools/perfrunner/workloads/vibed/source/app.d b/tools/perfrunner/workloads/vibed/source/app.d
new file mode 100644
index 000000000000..f38e3a3198ca
--- /dev/null
+++ b/tools/perfrunner/workloads/vibed/source/app.d
@@ -0,0 +1,5 @@
+import vibe.vibe;
+
+void main()
+{
+}