diff --git a/tree_builder_bench.ts b/tree_builder_bench.ts
new file mode 100644
index 0000000..8e13c1e
--- /dev/null
+++ b/tree_builder_bench.ts
@@ -0,0 +1,48 @@
+/**
+ * Benchmarks for tree materialization.
+ *
+ * @module bench
+ */
+// deno-lint-ignore-file no-import-prefix no-unversioned-import
+
+import { bench, do_not_optimize, run, summary } from 'npm:mitata';
+
+import {
+  createOutlineTreeBuildFixture,
+  createTreeBuildFixture,
+  cycleInputs,
+  drainBuildTreeFromEvents,
+  drainBuildTreeFromOutline,
+  SAME_SIZE_MIXED_TEXT,
+  SYNTHETIC_ARTICLE_INPUTS,
+} from './_test_utils/perf_fixtures.ts';
+
+const SAME_SIZE_TREE_FIXTURE = createTreeBuildFixture(SAME_SIZE_MIXED_TEXT);
+const SAME_SIZE_OUTLINE_TREE_FIXTURE = createOutlineTreeBuildFixture(SAME_SIZE_MIXED_TEXT);
+
+const TREE_BUILD_FIXTURES = SYNTHETIC_ARTICLE_INPUTS.map(createTreeBuildFixture);
+const OUTLINE_TREE_BUILD_FIXTURES = SYNTHETIC_ARTICLE_INPUTS.map(createOutlineTreeBuildFixture);
+const nextTreeBuildFixture = cycleInputs(TREE_BUILD_FIXTURES);
+const nextOutlineTreeBuildFixture = cycleInputs(OUTLINE_TREE_BUILD_FIXTURES);
+
+summary(() => {
+  bench('buildTree: same-size mixed (~8 KB)', () => {
+    do_not_optimize(drainBuildTreeFromEvents(SAME_SIZE_TREE_FIXTURE));
+  }).gc('inner');
+
+  bench('buildTree(outline): same-size mixed (~8 KB)', () => {
+    do_not_optimize(drainBuildTreeFromOutline(SAME_SIZE_OUTLINE_TREE_FIXTURE));
+  }).gc('inner');
+});
+
+summary(() => {
+  bench('buildTree: synthetic article (~35-45 KB)', () => {
+    do_not_optimize(drainBuildTreeFromEvents(nextTreeBuildFixture()));
+  }).gc('inner');
+
+  bench('buildTree(outline): synthetic article (~35-45 KB)', () => {
+    do_not_optimize(drainBuildTreeFromOutline(nextOutlineTreeBuildFixture()));
+  }).gc('inner');
+});
+
+await run();
\ No newline at end of file