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diff --git a/ocaml/test/old/bench_nock.ml b/ocaml/test/old/bench_nock.ml
new file mode 100644
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+++ b/ocaml/test/old/bench_nock.ml
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+open Nock_lib.Noun
+open Nock_lib.Nock
+
+(** Benchmark utilities *)
+
+let time_ms () =
+  Unix.gettimeofday () *. 1000.0
+
+let bench_nock name subject formula iterations =
+  (* Warmup *)
+  for _i = 1 to 100 do
+    let _ = nock subject formula in ()
+  done;
+
+  (* Actual benchmark *)
+  Gc.compact ();
+  let start = time_ms () in
+
+  for _i = 1 to iterations do
+    let _result = nock subject formula in ()
+  done;
+
+  let finish = time_ms () in
+  let total = finish -. start in
+  let per_iter = total /. (float_of_int iterations) in
+  let ops_per_sec = 1000.0 /. per_iter in
+
+  Printf.printf "%-30s %8d iterations in %10.2f ms (%10.6f ms/iter, %10.0f ops/sec)\n"
+    name iterations total per_iter ops_per_sec
+
+(** Benchmarks *)
+
+let () =
+  Printf.printf "Nock Benchmark - OCaml Implementation\n";
+  Printf.printf "======================================\n\n";
+
+  let iterations = 1_000_000 in  (* 1M iterations for fast ops *)
+  let slow_iters = 100_000 in    (* 100K for slower ops *)
+
+  (* Benchmark 0: slot lookup *)
+  begin
+    let subject = cell (atom 42) (atom 99) in
+    let formula = cell (atom 0) (atom 2) in  (* [0 2] - get head *)
+    bench_nock "Opcode 0: slot/fragment" subject formula iterations
+  end;
+
+  (* Benchmark 1: constant *)
+  begin
+    let subject = atom 0 in
+    let formula = cell (atom 1) (atom 42) in  (* [1 42] *)
+    bench_nock "Opcode 1: constant" subject formula iterations
+  end;
+
+  (* Benchmark 3: is-cell *)
+  begin
+    let subject = atom 0 in
+    let formula = cell (atom 3) (cell (atom 1) (atom 42)) in  (* [3 [1 42]] *)
+    bench_nock "Opcode 3: is-cell (atom)" subject formula iterations
+  end;
+
+  (* Benchmark 4: increment *)
+  begin
+    let subject = atom 0 in
+    let formula = cell (atom 4) (cell (atom 1) (atom 1000)) in  (* [4 [1 1000]] *)
+    bench_nock "Opcode 4: increment" subject formula iterations
+  end;
+
+  (* Benchmark 5: equality *)
+  begin
+    let subject = atom 0 in
+    (* [5 [1 42] [1 42]] *)
+    let formula = cell (atom 5) (cell (cell (atom 1) (atom 42)) (cell (atom 1) (atom 42))) in
+    bench_nock "Opcode 5: equality (equal)" subject formula iterations
+  end;
+
+  (* Benchmark 6: if-then-else *)
+  begin
+    let subject = atom 0 in
+    (* [6 [1 0] [1 11] [1 22]] *)
+    let formula = cell (atom 6)
+      (cell (cell (atom 1) (atom 0))
+        (cell (cell (atom 1) (atom 11))
+          (cell (atom 1) (atom 22)))) in
+    bench_nock "Opcode 6: if-then-else" subject formula iterations
+  end;
+
+  (* Benchmark 7: composition *)
+  begin
+    let subject = atom 42 in
+    (* [7 [1 99] [0 1]] *)
+    let formula = cell (atom 7) (cell (cell (atom 1) (atom 99)) (cell (atom 0) (atom 1))) in
+    bench_nock "Opcode 7: composition" subject formula iterations
+  end;
+
+  (* Benchmark 8: push *)
+  begin
+    let subject = atom 42 in
+    (* [8 [1 99] [0 1]] *)
+    let formula = cell (atom 8) (cell (cell (atom 1) (atom 99)) (cell (atom 0) (atom 1))) in
+    bench_nock "Opcode 8: push" subject formula iterations
+  end;
+
+  (* Benchmark: Decrement-like operation (slower) *)
+  begin
+    (* [6 [5 [0 1] [1 0]] [1 0] [8 [1 0] [4 [0 3]]]] *)
+    (* This is: if(subject == 0) 0 else subject+1 (simplified) *)
+    let dec_fol = cell (atom 6)
+      (cell (cell (atom 5) (cell (cell (atom 0) (atom 1)) (cell (atom 1) (atom 0))))
+        (cell (cell (atom 1) (atom 0))
+          (cell (atom 8) (cell (cell (atom 1) (atom 0)) (cell (atom 4) (cell (atom 0) (atom 3))))))) in
+
+    let subject = atom 10 in
+    bench_nock "Complex: decrement loop" subject dec_fol slow_iters
+  end;
+
+  (* Benchmark: Tree construction *)
+  begin
+    let subject = atom 0 in
+    (* [[1 1] [1 2]] - constructs a cell *)
+    let formula = cell (cell (atom 1) (atom 1)) (cell (atom 1) (atom 2)) in
+    bench_nock "Cell construction" subject formula iterations
+  end;
+
+  (* Benchmark: Deep slot lookup *)
+  begin
+    (* Build a deep tree: [[[[1 2] 3] 4] 5] *)
+    let subject = cell (cell (cell (cell (atom 1) (atom 2)) (atom 3)) (atom 4)) (atom 5) in
+    let formula = cell (atom 0) (atom 16) in  (* slot 16 = deepest left (1) *)
+    bench_nock "Deep slot lookup (depth 4)" subject formula iterations
+  end;
+
+  Printf.printf "\n"