diff --git a/src/core/CCVector.ml b/src/core/CCVector.ml
index 8ce99034..719ea85e 100644
--- a/src/core/CCVector.ml
+++ b/src/core/CCVector.ml
@@ -79,9 +79,13 @@ let init n f = {
 }
 
 (* is the underlying array empty? *)
-let array_is_empty_ v =
+let[@inline] array_is_empty_ v =
   Array.length v.vec = 0
 
+(* next capacity, if current one is [n] *)
+let[@inline] next_grow_ n =
+  min Sys.max_array_length (n + n lsr 1 + 2)
+
 (* resize the underlying array using x to temporarily fill the array *)
 let resize_ v newcapacity x =
   assert (newcapacity >= v.size);
@@ -128,7 +132,7 @@ let grow_with_ v ~filler:x =
     fill_with_junk_ v.vec 0 len;
   ) else (
     let n = Array.length v.vec in
-    let size = min (2 * n + 3) Sys.max_array_length in
+    let size = next_grow_ n in
     if size = n then invalid_arg "vec: can't grow any further";
     resize_ v size v.vec.(0)
   )
@@ -143,8 +147,8 @@ let ensure_assuming_not_empty_ v ~size =
   ) else if size < Array.length v.vec then (
     () (* nothing to do *)
   ) else (
-    let n = ref (max 8 (Array.length v.vec)) in
-    while !n < size do n := min Sys.max_array_length (2* !n) done;
+    let n = ref (Array.length v.vec) in
+    while !n < size do n := next_grow_ !n done;
     resize_ v !n v.vec.(0)
   )
 
@@ -161,7 +165,7 @@ let ensure v size =
     ensure_assuming_not_empty_  v ~size
   )
 
-let clear v =
+let[@inline] clear v =
   v.size <- 0
 
 (*$R
@@ -188,9 +192,9 @@ let clear_and_reset v =
   OUnit.assert_equal None (Weak.get a 0);
 *)
 
-let is_empty v = v.size = 0
+let[@inline] is_empty v = v.size = 0
 
-let push_unsafe_ v x =
+let[@inline] push_unsafe_ v x =
   Array.unsafe_set v.vec v.size x;
   v.size <- v.size + 1
 
@@ -296,11 +300,11 @@ let append a b =
   OUnit.assert_equal (Iter.to_array Iter.(6 -- 10)) (to_array b);
 *)
 
-let get v i =
+let[@inline] get v i =
   if i < 0 || i >= v.size then invalid_arg "CCVector.get";
   Array.unsafe_get v.vec i
 
-let set v i x =
+let[@inline] set v i x =
   if i < 0 || i >= v.size then invalid_arg "CCVector.set";
   Array.unsafe_set v.vec i x
 
@@ -341,7 +345,7 @@ let remove_unordered v i =
     to_list v1 = (List.sort CCInt.compare (to_list v2)))
 *)
 
-let append_iter a i = i (fun x -> push a x)
+let[@inline] append_iter a i = i (fun x -> push a x)
 
 let append_seq a seq = Seq.iter (fun x -> push a x) seq
 
@@ -477,12 +481,12 @@ let pop v =
   try Some (pop_exn v)
   with Empty -> None
 
-let top v =
-  if v.size = 0 then None else Some v.vec.(v.size-1)
+let[@inline] top v =
+  if v.size = 0 then None else Some (Array.unsafe_get v.vec (v.size-1))
 
-let top_exn v =
+let[@inline] top_exn v =
   if v.size = 0 then raise Empty;
-  v.vec.(v.size-1)
+  Array.unsafe_get v.vec (v.size-1)
 
 (*$T
   1 -- 10 |> top = Some 10
@@ -490,7 +494,7 @@ let top_exn v =
   1 -- 10 |> top_exn = 10
 *)
 
-let copy v = {
+let[@inline] copy v = {
   size = v.size;
   vec = Array.sub v.vec 0 v.size;
 }
diff --git a/src/core/dune b/src/core/dune
index d65c7d3f..ca13aa78 100644
--- a/src/core/dune
+++ b/src/core/dune
@@ -19,7 +19,6 @@
  (modules :standard \ mkshims)
  (flags :standard -warn-error -a+8 -w -32 -safe-string -strict-sequence -nolabels -open
    CCMonomorphic)
- (ocamlopt_flags (:include ../flambda.flags))
  (libraries seq either containers.monomorphic))
 
 (ocamllex (modules CCSexp_lex))
diff --git a/src/data/dune b/src/data/dune
index 9e9ace90..7c5c1868 100644
--- a/src/data/dune
+++ b/src/data/dune
@@ -4,5 +4,4 @@
   (public_name containers-data)
   (wrapped false)
   (flags :standard -w +a-4-42-44-48-50-58-32-60@8 -safe-string -open CCShims_)
-  (ocamlopt_flags :standard (:include ../flambda.flags))
   (libraries containers))
diff --git a/src/dune b/src/dune
index e7a035b6..21bb22a5 100644
--- a/src/dune
+++ b/src/dune
@@ -1,15 +1,10 @@
-(executable
-  (name mkflags)
-  (modules mkflags)
-  (libraries dune.configurator))
 
 (env
-  (_ (flags :standard -warn-error -3)))
-
-(rule
-  (targets flambda.flags)
-  (mode fallback)
-  (action (run ./mkflags.exe)))
+  (_
+    (flags :standard -warn-error -3 -color always)
+    (ocamlopt_flags :standard -O3 -unbox-closures -unbox-closures-factor 20
+                    -inline 100)
+     ))
 
 (executable
   (name mdx_runner)
diff --git a/src/mkflags.ml b/src/mkflags.ml
deleted file mode 100644
index 3c4ffca5..00000000
--- a/src/mkflags.ml
+++ /dev/null
@@ -1,19 +0,0 @@
-
-module C = Configurator.V1
-
-let () =
-  C.main ~name:"mkflags" (fun c ->
-    let version = C.ocaml_config_var_exn c "version" in
-    let major, minor =
-      Scanf.sscanf version "%u.%u"
-        (fun major minor -> major, minor)
-    in
-    let after_4_3 = (major, minor) >= (4, 3) in
-    let sexp =
-      if after_4_3 then (
-        ["-O3"; "-unbox-closures"; "-unbox-closures-factor"; "20"; "-color"; "always"]
-      ) else (
-        []
-      ) in
-    C.Flags.write_sexp "flambda.flags" sexp
-  )
diff --git a/src/monomorphic/dune b/src/monomorphic/dune
index 06b39722..c3a3bdbd 100644
--- a/src/monomorphic/dune
+++ b/src/monomorphic/dune
@@ -14,5 +14,4 @@
   (public_name containers.monomorphic)
   (modules CCMonomorphic CCMonomorphicShims_)
   (wrapped false)
-  (flags :standard -w +a-4-42-44-48-50-58-32-60@8 -safe-string)
-  (ocamlopt_flags :standard (:include ../flambda.flags)))
+  (flags :standard -w +a-4-42-44-48-50-58-32-60@8 -safe-string))
diff --git a/src/threads/dune b/src/threads/dune
index 55ce29ea..f27b5e65 100644
--- a/src/threads/dune
+++ b/src/threads/dune
@@ -5,6 +5,5 @@
   (wrapped false)
   (optional)
   (flags :standard -warn-error -a+8 -w -32 -safe-string -open CCShims_)
-  (ocamlopt_flags :standard (:include ../flambda.flags))
   (libraries containers threads))
 
diff --git a/src/top/dune b/src/top/dune
index a23a99e7..29a6a6b4 100644
--- a/src/top/dune
+++ b/src/top/dune
@@ -5,5 +5,4 @@
   (public_name containers.top)
   (wrapped false)
   (flags :standard -w +a-4-42-44-48-50-58-32-60@8 -safe-string)
-  (ocamlopt_flags :standard (:include ../flambda.flags))
   (libraries compiler-libs.common containers containers.unix))
diff --git a/src/unix/dune b/src/unix/dune
index bebb4ead..aa387981 100644
--- a/src/unix/dune
+++ b/src/unix/dune
@@ -5,6 +5,4 @@
   (wrapped false)
   (optional)
   (flags :standard -w +a-4-42-44-48-50-58-32-60@8 -safe-string)
-  (ocamlopt_flags :standard (:include ../flambda.flags))
-  (libraries unix)
-  )
+  (libraries unix))