The difference appears to be that a pad lookup requires a single opcode where dereferencing a hashref requires three opcodes: 

9     <;> nextstate(main 47 -e:1) v:%,{ ->a                   f     <;
+> nextstate(main 47 -e:1) v:%,{ ->g
a     <;> nextstate(main 47 -e:1) v:%,{ ->b                   g     <;
+> nextstate(main 47 -e:1) v:%,{ ->h
m     <2> leaveloop vK/2 ->n                                  u     <2
+> leaveloop vK/2 ->v
f        <{> enteriter(next->j last->m redo->g) lKS/8 ->k     l       
+ <{> enteriter(next->r last->u redo->m) lKS/8 ->s
-           <0> ex-pushmark s ->b                             -       
+    <0> ex-pushmark s ->h
-           <1> ex-list lK ->e                                -       
+    <1> ex-list lK ->k
b              <0> pushmark s ->c                             h       
+       <0> pushmark s ->i
c              <$> const[IV 1] s ->d                          i       
+       <$> const[IV 1] s ->j
d              <$> const[IV 10] s ->e                         j       
+       <$> const[IV 10] s ->k
e           <#> gv[*_] s ->f                                  k       
+    <#> gv[*_] s ->l
-        <1> null vK/1 ->m                                    -       
+ <1> null vK/1 ->u
l           <|> and(other->g) vK/1 ->m                        t       
+    <|> and(other->m) vK/1 ->u
k              <0> iter s ->l                                 s       
+       <0> iter s ->t
-              <@> lineseq vK ->-                             -       
+       <@> lineseq vK ->-
i                 <1> exists vK/1 ->j                         q       
+          <1> exists vK/1 ->r
-                    <1> ex-helem sK/2 ->i                    -       
+             <1> ex-helem sK/2 ->q
g                       <0> padhv[%h:46,47] sR ->h            o       
+                <1> rv2hv[t8] sKR/1 ->p
                                                              n       
+                   <1> rv2sv sKM/DREFHV,1 ->o
                                                              m       
+                      <#> gv[*r] s ->n
-                       <1> ex-rv2sv sK/1 ->-                 -       
+                <1> ex-rv2sv sK/1 ->-
h                          <#> gvsv[*_] s ->i                 p       
+                   <#> gvsv[*_] s ->q
j                 <0> unstack v ->k                           r       
+          <0> unstack v ->s
-e syntax OK                                                  -e synta
+x OK

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In reply to Re^5: Faster Hash Slices by BrowserUk
in thread Faster Hash Slices by jht

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