diff --git a/go.mod b/go.mod
index 73352a4..ccc5cb4 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,8 @@ go 1.18
 require (
 	github.com/koykov/bytealg v1.0.7
 	github.com/koykov/byteconv v1.0.1
-	github.com/koykov/vector v1.2.7
+	github.com/koykov/simd v0.0.9
+	github.com/koykov/vector v1.2.9
 )
 
 require (
@@ -13,5 +14,5 @@ require (
 	github.com/koykov/byteseq v1.0.2 // indirect
 	github.com/koykov/entry v1.0.2 // indirect
 	github.com/koykov/indirect v1.0.1 // indirect
-	github.com/koykov/openrt v0.0.0-20240728195600-ccc3242946f9 // indirect
+	golang.org/x/sys v0.30.0 // indirect
 )
diff --git a/go.sum b/go.sum
index cc93de1..5d9690f 100644
--- a/go.sum
+++ b/go.sum
@@ -10,7 +10,9 @@ github.com/koykov/entry v1.0.2 h1:6mZJUt4POGQHRPJ9Iw4GyIZJi9wj2lews3yRRNHfTY4=
 github.com/koykov/entry v1.0.2/go.mod h1:WmCy/YM0sPb4ETL9wYY0OJwO89KJ7qeQPGOwLUG4rZU=
 github.com/koykov/indirect v1.0.1 h1:1veVipIWBeklFHMvzuwhL82X5eDaJzN+hPeVGRvu22Y=
 github.com/koykov/indirect v1.0.1/go.mod h1:2qWC0hrIHIexlKaqPA0VWEa0s2V/qxxNJv7XPncnh2I=
-github.com/koykov/openrt v0.0.0-20240728195600-ccc3242946f9 h1:BZvoBH5eeWfqd74OnY4G3u81zPl52mYg2rF9I2dM0cE=
-github.com/koykov/openrt v0.0.0-20240728195600-ccc3242946f9/go.mod h1:y8Xa99HTBmthCilUUW36IZJd5SP9Rb+W8S9CJaauyU8=
-github.com/koykov/vector v1.2.7 h1:DmZYbqY+6pslQLuRxdn8W6XiAnWriQEqIbwAq8F5QLU=
-github.com/koykov/vector v1.2.7/go.mod h1:z5OScTfTaFdv6tHFoNqyuXslw5YIkKkGORc5RiAlDKk=
+github.com/koykov/simd v0.0.9 h1:ooXO/cEcIcDGmcHnPSnWRCe+8dS9z9kMUM4cc6Gwr0g=
+github.com/koykov/simd v0.0.9/go.mod h1:sxZxJ0LR+ZMZ85Gg6Ujd4ABNst4bNf9ylh894fpohp8=
+github.com/koykov/vector v1.2.9 h1:1yfqMvrtkjpX0Y78gRym28oTd1iu0WBdo1JCxotPlz4=
+github.com/koykov/vector v1.2.9/go.mod h1:yF41B972ZGEtbHhOLza3KS5WBzHVeALV/kGThCWDTN8=
+golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
+golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
diff --git a/parser.go b/parser.go
index e9264b2..f7083c3 100644
--- a/parser.go
+++ b/parser.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 
 	"github.com/koykov/bytealg"
+	"github.com/koykov/simd/indexbyte"
 	"github.com/koykov/vector"
 )
 
@@ -81,31 +82,13 @@ func (vec *Vector) parseGeneric(depth, offset int, node *vector.Node) (int, erro
 		// Save offset of string value.
 		node.Value().SetAddr(srcp, n).SetOffset(offset + 1)
 		// Get index of end of string value.
-		e := bytealg.IndexByteAtBytes(src, '"', offset+1)
+		e := indexbyte.IndexAtNE(src, '"', offset+1)
 		if e < 0 {
 			return n, vector.ErrUnexpEOS
 		}
 		node.Value().SetBit(flagEscape, true) // Always mark string as escaped to avoid double indexing.
-		if src[e-1] != '\\' {
-			// Good case - quote isn't escaped.
-			node.Value().SetLen(e - offset - 1)
-			offset = e + 1
-		} else {
-			// Walk over quotas and look for unescaped one.
-			for i := e; i < n; {
-				i = bytealg.IndexByteAtBytes(src, '"', i+1)
-				if i < 0 {
-					e = n - 1
-					break
-				}
-				e = i
-				if src[e-1] != '\\' {
-					break
-				}
-			}
-			node.Value().SetLen(e - offset - 1)
-			offset = e + 1
-		}
+		node.Value().SetLen(e - offset - 1)
+		offset = e + 1
 	case isDigit(src[offset]):
 		// Check number node.
 		if offset < n {
@@ -165,7 +148,7 @@ func (vec *Vector) parseObject(depth, offset int, node *vector.Node) (int, error
 			offset++
 			break
 		}
-		if offset, eof = bytealg.SkipBytesFmt4(src, offset); eof {
+		if offset, eof = skipfmt(src, offset); eof {
 			return offset, vector.ErrUnexpEOF
 		}
 		// Parse key.
@@ -178,33 +161,14 @@ func (vec *Vector) parseObject(depth, offset int, node *vector.Node) (int, error
 		child, i := vec.AcquireChildWithType(node, depth, vector.TypeUnknown)
 		// Fill up key's offset and length.
 		child.Key().TakeAddr(src).SetOffset(offset)
-		e := bytealg.IndexByteAtBytes(src, '"', offset+1)
+		e := vec.parseKey(src, offset+1)
 		if e < 0 {
 			return n, vector.ErrUnexpEOS
 		}
-		child.Key().SetBit(flagEscape, false)
-		if src[e-1] != '\\' {
-			// Key is an unescaped string, good case.
-			child.Key().SetLen(e - offset)
-			offset = e + 1
-		} else {
-			// Key contains escaped bytes.
-			for i := e; i < n; {
-				i = bytealg.IndexByteAtBytes(src, '"', i+1)
-				if i < 0 {
-					e = n - 1
-					break
-				}
-				e = i
-				if src[e-1] != '\\' {
-					break
-				}
-			}
-			child.Key().SetLen(e - offset)
-			child.Key().SetBit(flagEscape, true)
-			offset = e + 1
-		}
-		if offset, eof = bytealg.SkipBytesFmt4(src, offset); eof {
+		child.Key().SetLen(e - offset)
+		child.Key().SetBit(flagEscape, true)
+		offset = e + 1
+		if offset, eof = skipfmt(src, offset); eof {
 			return offset, vector.ErrUnexpEOF
 		}
 		// Check division symbol.
@@ -213,7 +177,7 @@ func (vec *Vector) parseObject(depth, offset int, node *vector.Node) (int, error
 		} else {
 			return offset, vector.ErrUnexpId
 		}
-		if offset, eof = bytealg.SkipBytesFmt4(src, offset); eof {
+		if offset, eof = skipfmt(src, offset); eof {
 			return offset, vector.ErrUnexpEOF
 		}
 		// Parse value.
@@ -223,7 +187,7 @@ func (vec *Vector) parseObject(depth, offset int, node *vector.Node) (int, error
 		}
 		// Return updated node to the vector.
 		vec.ReleaseNode(i, child)
-		if offset, eof = bytealg.SkipBytesFmt4(src, offset); eof {
+		if offset, eof = skipfmt(src, offset); eof {
 			return offset, vector.ErrUnexpEOF
 		}
 		if src[offset] == '}' {
@@ -237,7 +201,7 @@ func (vec *Vector) parseObject(depth, offset int, node *vector.Node) (int, error
 		} else {
 			return offset, vector.ErrUnexpId
 		}
-		if offset, eof = bytealg.SkipBytesFmt4(src, offset); eof {
+		if offset, eof = skipfmt(src, offset); eof {
 			return offset, vector.ErrUnexpEOF
 		}
 	}
@@ -261,7 +225,7 @@ func (vec *Vector) parseArray(depth, offset int, node *vector.Node) (int, error)
 			offset++
 			break
 		}
-		if offset, eof = bytealg.SkipBytesFmt4(src, offset); eof {
+		if offset, eof = skipfmt(src, offset); eof {
 			return offset, vector.ErrUnexpEOF
 		}
 		if src[offset] == ']' {
@@ -277,7 +241,7 @@ func (vec *Vector) parseArray(depth, offset int, node *vector.Node) (int, error)
 		}
 		// Return updated node to the vector.
 		vec.ReleaseNode(i, child)
-		if offset, eof = bytealg.SkipBytesFmt4(src, offset); eof {
+		if offset, eof = skipfmt(src, offset); eof {
 			return offset, vector.ErrUnexpEOF
 		}
 		if src[offset] == ']' {
@@ -291,9 +255,31 @@ func (vec *Vector) parseArray(depth, offset int, node *vector.Node) (int, error)
 		} else {
 			return offset, vector.ErrUnexpId
 		}
-		if offset, eof = bytealg.SkipBytesFmt4(src, offset); eof {
+		if offset, eof = skipfmt(src, offset); eof {
 			return offset, vector.ErrUnexpEOF
 		}
 	}
 	return offset, nil
 }
+
+func (vec *Vector) parseKey(src []byte, offset int) int {
+	n := len(src)
+	_ = src[n-1]
+	mn := imin(n, 8)
+	for i := offset; i < offset+mn; i++ {
+		if src[i] == '"' {
+			return i
+		}
+		if src[i] == '\\' {
+			break
+		}
+	}
+	return indexbyte.IndexAtNE(src, '"', offset)
+}
+
+func imin(a, b int) (r int) {
+	if r = a; r > b {
+		r = b
+	}
+	return
+}
diff --git a/skipfmt.go b/skipfmt.go
new file mode 100644
index 0000000..e4864a4
--- /dev/null
+++ b/skipfmt.go
@@ -0,0 +1,10 @@
+package jsonvector
+
+import "github.com/koykov/bytealg"
+
+func skipfmt(p []byte, off int) (int, bool) {
+	if p[off] > 0x20 {
+		return off, false
+	}
+	return bytealg.SkipBytesFmt4(p, off)
+}
diff --git a/testdata/scalarString1KB.json b/testdata/scalarString1KB.json
new file mode 100644
index 0000000..0fbab72
--- /dev/null
+++ b/testdata/scalarString1KB.json
@@ -0,0 +1 @@
+"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"
diff --git a/unescape.go b/unescape.go
index e69950b..58fba8b 100644
--- a/unescape.go
+++ b/unescape.go
@@ -1,18 +1,17 @@
 package jsonvector
 
 import (
-	"strconv"
 	"unicode/utf16"
 
-	"github.com/koykov/bytealg"
-	"github.com/koykov/byteconv"
+	"github.com/koykov/simd/indexbyte"
 )
 
 // Unescape byte array using itself as a destination.
 func Unescape(p []byte) []byte {
-	l, i := len(p), 0
+	l := len(p)
+	var i int
 	for {
-		i = bytealg.IndexByteAtBytes(p, '\\', i)
+		i = indexbyte.IndexAt(p, '\\', i)
 		if i < 0 || i+1 == l {
 			break
 		}
@@ -51,11 +50,7 @@ func Unescape(p []byte) []byte {
 				continue
 			}
 			x := p[i+2 : i+6]
-			u, err := strconv.ParseUint(byteconv.B2S(x), 16, 16)
-			if err != nil {
-				i++
-				continue
-			}
+			u := xtouTable(x)
 			r := rune(u)
 			if !utf16.IsSurrogate(r) {
 				// Regular utf8 symbol.
@@ -76,11 +71,7 @@ func Unescape(p []byte) []byte {
 					continue
 				} else {
 					x = p[i+8 : i+12]
-					u1, err := strconv.ParseUint(byteconv.B2S(x), 16, 16)
-					if err != nil {
-						i++
-						continue
-					}
+					u1 := xtouTable(x)
 					r = utf16.DecodeRune(r, rune(u1))
 					s := string(r)
 					z := len(s)
diff --git a/vector_test.go b/vector_test.go
index 2bc9b9c..dadc410 100644
--- a/vector_test.go
+++ b/vector_test.go
@@ -223,6 +223,11 @@ func BenchmarkScalar(b *testing.B) {
 			assertNode(b, vec, "", `foo "bar" string`)
 		})
 	})
+	b.Run("scalarString1KB", func(b *testing.B) {
+		bench(b, func(vec *Vector) {
+			assertType(b, vec, "", vector.TypeString)
+		})
+	})
 	b.Run("scalarNumber", func(b *testing.B) {
 		bench(b, func(vec *Vector) {
 			assertType(b, vec, "", vector.TypeNumber)
diff --git a/xtou.go b/xtou.go
new file mode 100644
index 0000000..ec170b3
--- /dev/null
+++ b/xtou.go
@@ -0,0 +1,20 @@
+package jsonvector
+
+var tableXTOU [256]byte
+
+func init() {
+	for c := '0'; c <= '9'; c++ {
+		tableXTOU[c] = uint8(c - '0')
+	}
+	for c := 'a'; c <= 'f'; c++ {
+		tableXTOU[c] = uint8(c - 'a' + 10)
+	}
+	for c := 'A'; c <= 'F'; c++ {
+		tableXTOU[c] = uint8(c - 'A' + 10)
+	}
+}
+
+func xtouTable(s []byte) uint64 {
+	_, _ = tableXTOU[255], s[3]
+	return uint64(tableXTOU[s[0]])<<12 | uint64(tableXTOU[s[1]])<<8 | uint64(tableXTOU[s[2]])<<4 | uint64(tableXTOU[s[3]])
+}