diff --git a/embed/bcw2/bcw2.wasm b/embed/bcw2/bcw2.wasm
index fedb5522..d770edab 100755
Binary files a/embed/bcw2/bcw2.wasm and b/embed/bcw2/bcw2.wasm differ
diff --git a/embed/bcw2/build.sh b/embed/bcw2/build.sh
index 3aee93f4..83fc712a 100755
--- a/embed/bcw2/build.sh
+++ b/embed/bcw2/build.sh
@@ -60,7 +60,7 @@ cd ~-
 
 "$BINARYEN/wasm-ctor-eval" -g -c _initialize bcw2.wasm -o bcw2.tmp
 "$BINARYEN/wasm-opt" -g --strip --strip-producers -c -O3 \
-	bcw2.tmp -o bcw2.wasm \
+	bcw2.tmp -o bcw2.wasm --low-memory-unused \
 	--enable-simd --enable-mutable-globals --enable-multivalue \
 	--enable-bulk-memory --enable-reference-types \
 	--enable-nontrapping-float-to-int --enable-sign-ext
\ No newline at end of file
diff --git a/embed/build.sh b/embed/build.sh
index a6b21d36..117f8f15 100755
--- a/embed/build.sh
+++ b/embed/build.sh
@@ -27,7 +27,7 @@ trap 'rm -f sqlite3.tmp' EXIT
 
 "$BINARYEN/wasm-ctor-eval" -g -c _initialize sqlite3.wasm -o sqlite3.tmp
 "$BINARYEN/wasm-opt" -g --strip --strip-producers -c -O3 \
-	sqlite3.tmp -o sqlite3.wasm \
+	sqlite3.tmp -o sqlite3.wasm --low-memory-unused \
 	--enable-simd --enable-mutable-globals --enable-multivalue \
 	--enable-bulk-memory --enable-reference-types \
 	--enable-nontrapping-float-to-int --enable-sign-ext
\ No newline at end of file
diff --git a/embed/sqlite3.wasm b/embed/sqlite3.wasm
index 31e10431..7be8de59 100755
Binary files a/embed/sqlite3.wasm and b/embed/sqlite3.wasm differ
diff --git a/sqlite3/libc/build.sh b/sqlite3/libc/build.sh
index 44deede4..3d9aa3dc 100755
--- a/sqlite3/libc/build.sh
+++ b/sqlite3/libc/build.sh
@@ -18,6 +18,8 @@ trap 'rm -f libc.tmp' EXIT
 	-mbulk-memory -mreference-types \
 	-mnontrapping-fptoint -msign-ext \
 	-fno-stack-protector -fno-stack-clash-protection \
+	-Wl,--stack-first \
+	-Wl,--import-undefined \
 	-Wl,--initial-memory=16777216 \
 	-Wl,--export=memchr \
 	-Wl,--export=memcmp \
diff --git a/sqlite3/libc/libc.wasm b/sqlite3/libc/libc.wasm
index 1e4a98c2..68687cdf 100755
Binary files a/sqlite3/libc/libc.wasm and b/sqlite3/libc/libc.wasm differ
diff --git a/sqlite3/libc/libc.wat b/sqlite3/libc/libc.wat
index a88fc63f..43545045 100644
--- a/sqlite3/libc/libc.wat
+++ b/sqlite3/libc/libc.wat
@@ -3,7 +3,7 @@
  (type $1 (func (param i32 i32) (result i32)))
  (type $2 (func (param i32) (result i32)))
  (memory $0 256)
- (data $0 (i32.const 1024) "\01")
+ (data $0 (i32.const 65536) "\01")
  (export "memory" (memory $0))
  (export "memset" (func $memset))
  (export "memcpy" (func $memcpy))
@@ -229,62 +229,70 @@
   (local $1 i32)
   (local $2 i32)
   (local $3 v128)
-  (local $scratch v128)
-  (if
-   (i32.eqz
-    (local.tee $2
-     (i32.and
-      (i8x16.bitmask
-       (i8x16.eq
-        (v128.load
-         (local.tee $1
-          (i32.and
-           (local.get $0)
-           (i32.const -16)
-          )
+  (block $block1
+   (block $block
+    (br_if $block
+     (i8x16.all_true
+      (local.tee $3
+       (v128.load
+        (local.tee $1
+         (i32.and
+          (local.get $0)
+          (i32.const -16)
          )
         )
-        (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
-       )
-      )
-      (i32.shl
-       (i32.const -1)
-       (i32.and
-        (local.get $0)
-        (i32.const 15)
        )
       )
      )
     )
-   )
-   (then
-    (loop $label
-     (br_if $label
-      (i32.eqz
-       (local.tee $2
+    (br_if $block
+     (i32.eqz
+      (local.tee $2
+       (i32.and
         (i8x16.bitmask
          (i8x16.eq
-          (block (result v128)
-           (local.set $scratch
-            (v128.load offset=16
-             (local.get $1)
-            )
-           )
-           (local.set $1
-            (i32.add
-             (local.get $1)
-             (i32.const 16)
-            )
-           )
-           (local.get $scratch)
-          )
+          (local.get $3)
           (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
          )
         )
+        (i32.shl
+         (i32.const -1)
+         (i32.and
+          (local.get $0)
+          (i32.const 15)
+         )
+        )
        )
       )
      )
     )
+    (br $block1)
+   )
+   (loop $label
+    (local.set $3
+     (v128.load offset=16
+      (local.get $1)
+     )
+    )
+    (local.set $1
+     (i32.add
+      (local.get $1)
+      (i32.const 16)
+     )
+    )
+    (br_if $label
+     (i8x16.all_true
+      (local.get $3)
+     )
+    )
+   )
+   (local.set $2
+    (i8x16.bitmask
+     (i8x16.eq
+      (local.get $3)
+      (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
+     )
+    )
    )
   )
   (i32.add
@@ -624,74 +632,81 @@
   (i32.const 0)
  )
  (func $strchrnul (param $0 i32) (param $1 i32) (result i32)
-  (local $2 i32)
+  (local $2 v128)
   (local $3 v128)
-  (local $4 v128)
-  (if
-   (i32.eqz
-    (local.tee $0
-     (i32.and
-      (i8x16.bitmask
-       (v128.or
-        (i8x16.eq
-         (local.tee $3
-          (v128.load
-           (local.tee $2
-            (i32.and
-             (local.get $0)
-             (i32.const -16)
-            )
+  (local $4 i32)
+  (block $block
+   (if
+    (v128.any_true
+     (local.tee $2
+      (v128.or
+       (i8x16.eq
+        (local.tee $2
+         (v128.load
+          (local.tee $4
+           (i32.and
+            (local.get $0)
+            (i32.const -16)
            )
           )
          )
-         (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
         )
-        (i8x16.eq
-         (local.get $3)
-         (local.tee $4
-          (i8x16.splat
-           (local.get $1)
-          )
+        (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
+       )
+       (i8x16.eq
+        (local.get $2)
+        (local.tee $3
+         (i8x16.splat
+          (local.get $1)
          )
         )
        )
       )
-      (i32.shl
-       (i32.const -1)
+     )
+    )
+    (then
+     (br_if $block
+      (local.tee $0
        (i32.and
-        (local.get $0)
-        (i32.const 15)
+        (i8x16.bitmask
+         (local.get $2)
+        )
+        (i32.shl
+         (i32.const -1)
+         (i32.and
+          (local.get $0)
+          (i32.const 15)
+         )
+        )
        )
       )
      )
     )
    )
-   (then
-    (loop $label
-     (local.set $3
-      (v128.load offset=16
-       (local.get $2)
-      )
+   (loop $label
+    (local.set $2
+     (v128.load offset=16
+      (local.get $4)
      )
-     (local.set $2
-      (i32.add
-       (local.get $2)
-       (i32.const 16)
-      )
+    )
+    (local.set $4
+     (i32.add
+      (local.get $4)
+      (i32.const 16)
      )
-     (br_if $label
-      (i32.eqz
-       (local.tee $0
-        (i8x16.bitmask
-         (v128.or
-          (i8x16.eq
-           (local.get $3)
-           (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
-          )
-          (i8x16.eq
-           (local.get $3)
-           (local.get $4)
-          )
+    )
+    (br_if $label
+     (i32.eqz
+      (v128.any_true
+       (local.tee $2
+        (v128.or
+         (i8x16.eq
+          (local.get $2)
+          (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
+         )
+         (i8x16.eq
+          (local.get $2)
+          (local.get $3)
          )
         )
        )
@@ -699,83 +714,95 @@
      )
     )
    )
+   (local.set $0
+    (i8x16.bitmask
+     (local.get $2)
+    )
+   )
   )
   (i32.add
-   (local.get $2)
+   (local.get $4)
    (i32.ctz
     (local.get $0)
    )
   )
  )
  (func $strchr (param $0 i32) (param $1 i32) (result i32)
-  (local $2 i32)
+  (local $2 v128)
   (local $3 v128)
-  (local $4 v128)
-  (if
-   (i32.eqz
-    (local.tee $0
-     (i32.and
-      (i8x16.bitmask
-       (v128.or
-        (i8x16.eq
-         (local.tee $3
-          (v128.load
-           (local.tee $2
-            (i32.and
-             (local.get $0)
-             (i32.const -16)
-            )
+  (local $4 i32)
+  (block $block
+   (if
+    (v128.any_true
+     (local.tee $2
+      (v128.or
+       (i8x16.eq
+        (local.tee $2
+         (v128.load
+          (local.tee $4
+           (i32.and
+            (local.get $0)
+            (i32.const -16)
            )
           )
          )
-         (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
         )
-        (i8x16.eq
-         (local.get $3)
-         (local.tee $4
-          (i8x16.splat
-           (local.get $1)
-          )
+        (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
+       )
+       (i8x16.eq
+        (local.get $2)
+        (local.tee $3
+         (i8x16.splat
+          (local.get $1)
          )
         )
        )
       )
-      (i32.shl
-       (i32.const -1)
+     )
+    )
+    (then
+     (br_if $block
+      (local.tee $0
        (i32.and
-        (local.get $0)
-        (i32.const 15)
+        (i8x16.bitmask
+         (local.get $2)
+        )
+        (i32.shl
+         (i32.const -1)
+         (i32.and
+          (local.get $0)
+          (i32.const 15)
+         )
+        )
        )
       )
      )
     )
    )
-   (then
-    (loop $label
-     (local.set $3
-      (v128.load offset=16
-       (local.get $2)
-      )
+   (loop $label
+    (local.set $2
+     (v128.load offset=16
+      (local.get $4)
      )
-     (local.set $2
-      (i32.add
-       (local.get $2)
-       (i32.const 16)
-      )
+    )
+    (local.set $4
+     (i32.add
+      (local.get $4)
+      (i32.const 16)
      )
-     (br_if $label
-      (i32.eqz
-       (local.tee $0
-        (i8x16.bitmask
-         (v128.or
-          (i8x16.eq
-           (local.get $3)
-           (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
-          )
-          (i8x16.eq
-           (local.get $3)
-           (local.get $4)
-          )
+    )
+    (br_if $label
+     (i32.eqz
+      (v128.any_true
+       (local.tee $2
+        (v128.or
+         (i8x16.eq
+          (local.get $2)
+          (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
+         )
+         (i8x16.eq
+          (local.get $2)
+          (local.get $3)
          )
         )
        )
@@ -783,11 +810,16 @@
      )
     )
    )
+   (local.set $0
+    (i8x16.bitmask
+     (local.get $2)
+    )
+   )
   )
   (select
    (local.tee $0
     (i32.add
-     (local.get $2)
+     (local.get $4)
      (i32.ctz
       (local.get $0)
      )
@@ -808,67 +840,72 @@
  (func $strspn (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (if
+   (i32.eqz
+    (local.tee $2
+     (i32.load8_u
+      (local.get $1)
+     )
+    )
+   )
+   (then
+    (return
+     (i32.const 0)
+    )
+   )
+  )
   (v128.store
-   (i32.const 66560)
+   (i32.const 65520)
    (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
   )
   (v128.store
-   (i32.const 66544)
+   (i32.const 65504)
    (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
   )
-  (if
-   (local.tee $2
-    (i32.load8_u
-     (local.get $1)
-    )
+  (local.set $1
+   (i32.add
+    (local.get $1)
+    (i32.const 1)
    )
-   (then
-    (local.set $1
+  )
+  (loop $label
+   (i32.store
+    (local.tee $3
      (i32.add
-      (local.get $1)
-      (i32.const 1)
-     )
-    )
-    (loop $label
-     (i32.store
-      (local.tee $3
-       (i32.add
-        (i32.and
-         (i32.shr_u
-          (local.get $2)
-          (i32.const 3)
-         )
-         (i32.const 28)
-        )
-        (i32.const 66544)
-       )
-      )
-      (i32.or
-       (i32.load
-        (local.get $3)
-       )
-       (i32.shl
-        (i32.const 1)
+      (i32.and
+       (i32.shr_u
         (local.get $2)
+        (i32.const 3)
        )
+       (i32.const 28)
       )
+      (i32.const 65504)
      )
-     (local.set $2
-      (i32.load8_u
-       (local.get $1)
-      )
-     )
-     (local.set $1
-      (i32.add
-       (local.get $1)
-       (i32.const 1)
-      )
+    )
+    (i32.or
+     (i32.load
+      (local.get $3)
      )
-     (br_if $label
+     (i32.shl
+      (i32.const 1)
       (local.get $2)
      )
     )
    )
+   (local.set $2
+    (i32.load8_u
+     (local.get $1)
+    )
+   )
+   (local.set $1
+    (i32.add
+     (local.get $1)
+     (i32.const 1)
+    )
+   )
+   (br_if $label
+    (local.get $2)
+   )
   )
   (if
    (local.tee $2
@@ -893,7 +930,7 @@
             )
             (i32.const 28)
            )
-           (i32.const 66544)
+           (i32.const 65504)
           )
          )
          (local.get $2)
@@ -952,71 +989,78 @@
      )
     )
    )
-   (if
-    (i32.eqz
-     (local.tee $2
-      (i32.and
-       (i8x16.bitmask
-        (v128.or
-         (i8x16.eq
-          (local.tee $4
-           (v128.load
-            (local.tee $1
-             (i32.and
-              (local.get $0)
-              (i32.const -16)
-             )
+   (block $block1
+    (if
+     (v128.any_true
+      (local.tee $4
+       (v128.or
+        (i8x16.eq
+         (local.tee $4
+          (v128.load
+           (local.tee $1
+            (i32.and
+             (local.get $0)
+             (i32.const -16)
             )
            )
           )
-          (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
          )
-         (i8x16.eq
-          (local.get $4)
-          (local.tee $5
-           (i8x16.splat
-            (local.get $2)
-           )
+         (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
+        )
+        (i8x16.eq
+         (local.get $4)
+         (local.tee $5
+          (i8x16.splat
+           (local.get $2)
           )
          )
         )
        )
-       (i32.shl
-        (i32.const -1)
+      )
+     )
+     (then
+      (br_if $block1
+       (local.tee $2
         (i32.and
-         (local.get $0)
-         (i32.const 15)
+         (i8x16.bitmask
+          (local.get $4)
+         )
+         (i32.shl
+          (i32.const -1)
+          (i32.and
+           (local.get $0)
+           (i32.const 15)
+          )
+         )
         )
        )
       )
      )
     )
-    (then
-     (loop $label
-      (local.set $4
-       (v128.load offset=16
-        (local.get $1)
-       )
+    (loop $label
+     (local.set $4
+      (v128.load offset=16
+       (local.get $1)
       )
-      (local.set $1
-       (i32.add
-        (local.get $1)
-        (i32.const 16)
-       )
+     )
+     (local.set $1
+      (i32.add
+       (local.get $1)
+       (i32.const 16)
       )
-      (br_if $label
-       (i32.eqz
-        (local.tee $2
-         (i8x16.bitmask
-          (v128.or
-           (i8x16.eq
-            (local.get $4)
-            (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
-           )
-           (i8x16.eq
-            (local.get $4)
-            (local.get $5)
-           )
+     )
+     (br_if $label
+      (i32.eqz
+       (v128.any_true
+        (local.tee $4
+         (v128.or
+          (i8x16.eq
+           (local.get $4)
+           (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
+          )
+          (i8x16.eq
+           (local.get $4)
+           (local.get $5)
           )
          )
         )
@@ -1024,6 +1068,11 @@
       )
      )
     )
+    (local.set $2
+     (i8x16.bitmask
+      (local.get $4)
+     )
+    )
    )
    (return
     (i32.sub
@@ -1038,11 +1087,11 @@
    )
   )
   (v128.store
-   (i32.const 66560)
+   (i32.const 65520)
    (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
   )
   (v128.store
-   (i32.const 66544)
+   (i32.const 65504)
    (v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
   )
   (local.set $1
@@ -1062,7 +1111,7 @@
        )
        (i32.const 28)
       )
-      (i32.const 66544)
+      (i32.const 65504)
      )
     )
     (i32.or
@@ -1112,7 +1161,7 @@
            )
            (i32.const 28)
           )
-          (i32.const 66544)
+          (i32.const 65504)
          )
         )
         (local.get $2)
diff --git a/sqlite3/strings.c b/sqlite3/strings.c
index fed7b48c..24cb9d79 100644
--- a/sqlite3/strings.c
+++ b/sqlite3/strings.c
@@ -66,10 +66,13 @@ size_t strlen(const char *s) {
   const v128_t *w = (void *)(s - align);
 
   while (true) {
-    int mask =
-        wasm_i8x16_bitmask(wasm_i8x16_eq(*w, (v128_t){})) >> align << align;
-    if (mask) {
-      return (char *)w - s + __builtin_ctz(mask);
+    if (!wasm_i8x16_all_true(*w)) {
+      const v128_t cmp = wasm_i8x16_eq(*w, (v128_t){});
+      int mask = wasm_i8x16_bitmask(cmp) >> align << align;
+      __builtin_assume(mask || align);
+      if (mask) {
+        return (char *)w - s + __builtin_ctz(mask);
+      }
     }
     align = 0;
     w++;
@@ -136,11 +139,13 @@ char *strchrnul(const char *s, int c) {
   const v128_t wc = wasm_i8x16_splat(c);
 
   while (true) {
-    int mask = wasm_i8x16_bitmask(wasm_i8x16_eq(*w, (v128_t){}) |
-                                  wasm_i8x16_eq(*w, wc)) >>
-               align << align;
-    if (mask) {
-      return (char *)w + __builtin_ctz(mask);
+    const v128_t cmp = wasm_i8x16_eq(*w, (v128_t){}) | wasm_i8x16_eq(*w, wc);
+    if (wasm_v128_any_true(cmp)) {
+      int mask = wasm_i8x16_bitmask(cmp) >> align << align;
+      __builtin_assume(mask || align);
+      if (mask) {
+        return (char *)w + __builtin_ctz(mask);
+      }
     }
     align = 0;
     w++;
@@ -159,6 +164,8 @@ char *strchr(const char *s, int c) {
    << ((b) % (8 * sizeof(size_t))))
 
 size_t strspn(const char *s, const char *c) {
+  if (!c[0]) return 0;
+
   const char *const a = s;
   size_t byteset[32 / sizeof(size_t)] = {0};
 
diff --git a/util/sql3util/wasm/build.sh b/util/sql3util/wasm/build.sh
index 71ad523e..53a00c5d 100755
--- a/util/sql3util/wasm/build.sh
+++ b/util/sql3util/wasm/build.sh
@@ -24,7 +24,7 @@ trap 'rm -f sql3parse_table.tmp' EXIT
 
 "$BINARYEN/wasm-ctor-eval" -c _initialize sql3parse_table.wasm -o sql3parse_table.tmp
 "$BINARYEN/wasm-opt" --strip --strip-debug --strip-producers -c -Oz \
-	sql3parse_table.tmp -o sql3parse_table.wasm \
+	sql3parse_table.tmp -o sql3parse_table.wasm --low-memory-unused \
 	--enable-simd --enable-mutable-globals --enable-multivalue \
 	--enable-bulk-memory --enable-reference-types \
 	--enable-nontrapping-float-to-int --enable-sign-ext
\ No newline at end of file
diff --git a/util/sql3util/wasm/sql3parse_table.wasm b/util/sql3util/wasm/sql3parse_table.wasm
index 9fe71846..fa8af14a 100755
Binary files a/util/sql3util/wasm/sql3parse_table.wasm and b/util/sql3util/wasm/sql3parse_table.wasm differ
diff --git a/vfs/tests/mptest/wasm/build.sh b/vfs/tests/mptest/wasm/build.sh
index 9e660cf9..18c2fd5b 100755
--- a/vfs/tests/mptest/wasm/build.sh
+++ b/vfs/tests/mptest/wasm/build.sh
@@ -26,7 +26,7 @@ WASI_SDK="$ROOT/tools/wasi-sdk/bin"
 	$(awk '{print "-Wl,--export="$0}' exports.txt)
 
 "$BINARYEN/wasm-opt" -g --strip --strip-producers -c -O3 \
-	mptest.wasm -o mptest.tmp \
+	mptest.wasm -o mptest.tmp --low-memory-unused \
 	--enable-simd --enable-mutable-globals --enable-multivalue \
 	--enable-bulk-memory --enable-reference-types \
 	--enable-nontrapping-float-to-int --enable-sign-ext
diff --git a/vfs/tests/mptest/wasm/mptest.wasm b/vfs/tests/mptest/wasm/mptest.wasm
index 063d883f..95942c08 100644
Binary files a/vfs/tests/mptest/wasm/mptest.wasm and b/vfs/tests/mptest/wasm/mptest.wasm differ
diff --git a/vfs/tests/speedtest1/wasm/build.sh b/vfs/tests/speedtest1/wasm/build.sh
index 833205f9..ffcf1572 100755
--- a/vfs/tests/speedtest1/wasm/build.sh
+++ b/vfs/tests/speedtest1/wasm/build.sh
@@ -21,7 +21,7 @@ WASI_SDK="$ROOT/tools/wasi-sdk/bin"
 	$(awk '{print "-Wl,--export="$0}' exports.txt)
 
 "$BINARYEN/wasm-opt" -g --strip --strip-producers -c -O3 \
-	speedtest1.wasm -o speedtest1.tmp \
+	speedtest1.wasm -o speedtest1.tmp --low-memory-unused \
 	--enable-simd --enable-mutable-globals --enable-multivalue \
 	--enable-bulk-memory --enable-reference-types \
 	--enable-nontrapping-float-to-int --enable-sign-ext
diff --git a/vfs/tests/speedtest1/wasm/speedtest1.wasm b/vfs/tests/speedtest1/wasm/speedtest1.wasm
index 3d2201f4..9d42a9e3 100644
Binary files a/vfs/tests/speedtest1/wasm/speedtest1.wasm and b/vfs/tests/speedtest1/wasm/speedtest1.wasm differ