diff --git a/tests/bench/sym/simp_3.lean b/tests/bench/sym/simp_3.lean
index d1a34d8125..46ef8369bc 100644
--- a/tests/bench/sym/simp_3.lean
+++ b/tests/bench/sym/simp_3.lean
@@ -12,6 +12,16 @@ def getProofSize (r : Sym.Simp.Result) : MetaM Nat := do
   | .rfl _ => return 0
   | .step _ p _ => (ShareCommon.shareCommon' p).numObjs
 
+def checkWithKernel (r : Sym.Simp.Result) : MetaM Float := do
+  match r with
+  | .rfl _ => return 0.0
+  | .step _ p _ =>
+    let p := ShareCommon.shareCommon' p
+    let startTime ← IO.monoNanosNow
+    Meta.checkWithKernel p
+    let endTime ← IO.monoNanosNow
+    return (endTime - startTime).toFloat / 1000000.0
+
 def mkSimpMethods : MetaM Sym.Simp.Methods := do
   let thms : Sym.Simp.Theorems := {}
   let thms := thms.insert (← Sym.Simp.mkTheoremFromDecl ``Nat.zero_add)
@@ -30,21 +40,37 @@ def simp (e : Expr) : MetaM (Sym.Simp.Result × Float) := Sym.SymM.run do
   -- | .rfl _ => logInfo "rfl"
   -- | .step e' h _ =>
   --   logInfo e'; logInfo h
-  --   let startTime ← IO.monoNanosNow
-  --   checkWithKernel h
-  --   let endTime ← IO.monoNanosNow
-  --   let timeMs := (endTime - startTime).toFloat / 1000000.0
-  --   logInfo s!"kernel time {timeMs} ms"
   return (r, timeMs)
 
-def mkLetBench (n : Nat) (includeUnused : Bool) : MetaM Expr := do
+def ppExample (e : Expr) : MetaM Unit := do
+  forallTelescope e fun _ e => do
+  IO.println "Example:"
+  IO.println (← ppExpr e)
+  IO.println "====>"
+  match (← simp e).1 with
+  | .rfl _ => IO.println "<no change>"
+  | .step e' _ _ =>
+    IO.println (← ppExpr e')
+  IO.println ""
+
+def benchSimp (name : String) (e : Expr) (check := false) : MetaM Unit :=
+  forallTelescope e fun _ e => do
+  let (r, timeMs) ← simp e
+  let proofSize ← getProofSize r
+  if check then
+    let kMs ← checkWithKernel r
+    IO.println s!"{name}: {timeMs}ms, kernel: {kMs}ms, proof_size={proofSize}"
+  else
+    IO.println s!"{name}: {timeMs}ms, proof_size={proofSize}"
+
+def mkHaveChainBench (n : Nat) (includeUnused : Bool) : MetaM Expr := do
   let zero := mkNatLit 0
   let one := mkNatLit 1
   let rec go (n : Nat) (xs : Array Expr) (v : Expr) (e : Expr) : MetaM Expr := do
     match n with
     | 0 => mkLetFVars (usedLetOnly := false) (generalizeNondepLet := false) xs e
     | n+1 =>
-      if includeUnused && n % 2 == 0 then
+      if !includeUnused || n % 2 == 0 then
         withLetDecl (nondep := true) `x (mkConst ``Nat) (mkNatAdd zero (mkNatAdd v one)) fun x =>
           go n (xs.push x) x (mkNatAdd zero (mkNatAdd e x))
       else
@@ -52,29 +78,81 @@ def mkLetBench (n : Nat) (includeUnused : Bool) : MetaM Expr := do
           go n (xs.push y) v (mkNatAdd zero (mkNatAdd e zero))
   go n #[] zero zero
 
-def benchLet (n : Nat) (includeUnused : Bool) : MetaM Unit := do
-  let e ← mkLetBench n includeUnused
-  let (r, timeMs) ← simp e
-  let proofSize ← getProofSize r
-  IO.println s!"have_{n}: {timeMs}ms, proof_size={proofSize}"
+def benchHaveChain (n : Nat) (includeUnused : Bool) (check : Bool := false) : MetaM Unit := do
+  let e ← mkHaveChainBench n includeUnused
+  let name := if includeUnused then s!"have_chain_unused_{n}" else s!"have_chain_{n}"
+  benchSimp name e check
+
+def mkHaveParallelBench (n : Nat) (simpValues : Bool) : MetaM Expr := do
+  withLocalDeclD `x Nat.mkType fun x => do
+    let zero := mkNatLit 0
+    let rec go (n : Nat) (xs : Array Expr) (e : Expr) : MetaM Expr := do
+      match n with
+      | 0 => mkLetFVars (usedLetOnly := false) (generalizeNondepLet := false) xs e
+      | n+1 =>
+        let val := if simpValues then
+          -- Values should be in `simp` normal form
+          mkNatAdd x (mkNatLit n)
+        else
+          mkNatAdd zero (mkNatAdd x (mkNatLit n))
+        withLetDecl (nondep := true) `y (mkConst ``Nat) val fun x =>
+          go n (xs.push x) (mkNatAdd x e)
+    let r ← go n #[] zero
+    mkForallFVars #[x] r
+
+def benchHaveParallel (n : Nat) (simpValues : Bool) (check : Bool := false) : MetaM Unit := do
+  let e ← mkHaveParallelBench n simpValues
+  let name := if simpValues then s!"have_parallel_simp_vals_{n}" else s!"have_parallel_unsimp_vals_{n}"
+  benchSimp name e check
+
+def mkHaveChain1Bench (n : Nat) : MetaM Expr := do
+  let zero := mkNatLit 0
+  let one := mkNatLit 1
+  let rec go (n : Nat) (xs : Array Expr) (v : Expr) (e : Expr) : MetaM Expr := do
+    match n with
+    | 0 => mkLetFVars (usedLetOnly := false) (generalizeNondepLet := false) xs (mkNatAdd v e)
+    | n+1 =>
+      withLetDecl (nondep := true) `x (mkConst ``Nat) (mkNatAdd zero (mkNatAdd v one)) fun x =>
+        go n (xs.push x) x (mkNatAdd one e)
+  go n #[] zero zero
+
+def benchHaveChain1 (n : Nat) (check : Bool := false) : MetaM Unit := do
+  let e ← mkHaveChain1Bench n
+  benchSimp s!"have_chain1_{n}" e check
+
+def run (k : Nat → MetaM Unit) : MetaM Unit := do
+  for n in [10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 200, 300, 400, 500,
+    600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000] do
+    k n
 
 set_option maxRecDepth 100000
 
 /-! ## Run all benchmarks -/
 def runAllBenchmarks : MetaM Unit := do
-  IO.println "=== Simplifier Stress Tests ==="
+  IO.println "=== Simplifier Have-telescope Stress Tests ==="
   IO.println ""
 
   IO.println ""
-  IO.println "--- Benchmark 1: have block without unused variables ---"
-  for n in [10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 200, 300, 400, 500,
-    600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000] do
-    benchLet n false
+  IO.println "--- Benchmark 1: have-telescope chain without unused variables ---"
+  ppExample (← mkHaveChainBench 5 false)
+  run fun n => benchHaveChain n false (n < 110)
 
-  IO.println "--- Benchmark 2: have block with unused variables ---"
-  for n in [10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 200, 300, 400, 500,
-    600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000] do
-    benchLet n true
+  IO.println "--- Benchmark 2: have-telescope chain with unused variables ---"
+  ppExample (← mkHaveChainBench 5 true)
+  run fun n => benchHaveChain n true (n < 120)
+
+  IO.println "--- Benchmark 3: have-telescope parallel declarations with simplified values ---"
+  ppExample (← mkHaveParallelBench 5 true)
+  run fun n => benchHaveParallel n true (n < 120)
+
+  IO.println "--- Benchmark 4: have-telescope parallel declarations with unsimplified values ---"
+  ppExample (← mkHaveParallelBench 5 false)
+  run fun n => benchHaveParallel n false (n < 120)
+
+  IO.println ""
+  IO.println "--- Benchmark 5: have-telescope chain with 1 dep ---"
+  ppExample (← mkHaveChain1Bench 5)
+  run fun n => benchHaveChain1 n (n < 600)
 
 #eval runAllBenchmarks