diff --git a/extra/builder/benchmark/benchmark.factor b/extra/builder/benchmark/benchmark.factor
new file mode 100644
index 0000000000..48891593d2
--- /dev/null
+++ b/extra/builder/benchmark/benchmark.factor
@@ -0,0 +1,41 @@
+
+USING: kernel continuations arrays assocs sequences sorting math
+       io io.styles prettyprint builder.util ;
+
+IN: builder.benchmark
+
+: passing-benchmarks ( table -- table )
+  [ second first2 number? swap number? and ] subset ;
+
+: simplify-table ( table -- table ) [ first2 second 2array ] map ;
+
+: benchmark-difference ( old-table benchmark-result -- result-diff )
+  first2 >r
+  tuck swap at
+  r>
+  swap -
+  2array ;
+
+: compare-tables ( old new -- table )
+  [ passing-benchmarks simplify-table ] 2apply
+  [ benchmark-difference ] with map ;
+
+: benchmark-deltas ( -- table )
+  "../../benchmarks" "../benchmarks" [ eval-file ] 2apply
+  compare-tables
+  sort-values ;
+
+: benchmark-deltas. ( deltas -- )
+  standard-table-style
+    [
+      [ [ "Benchmark" write ] with-cell [ "Delta (ms)" write ] with-cell ]
+      with-row
+      [ [ swap [ write ] with-cell pprint-cell ] with-row ]
+      assoc-each
+    ]
+  tabular-output ;
+
+: show-benchmark-deltas ( -- )
+  [ benchmark-deltas benchmark-deltas. ]
+    [ drop "Error generating benchmark deltas" . ]
+  recover ;
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