diff --git a/.gitignore b/.gitignore
index a96dfe6..1a0170a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -33,3 +33,7 @@ debug_test
 
 # Mac
 .DS_Store
+
+# ignore local work file
+go.work
+go.work.sum
\ No newline at end of file
diff --git a/README.md b/README.md
index 356ff6d..34dcab8 100644
--- a/README.md
+++ b/README.md
@@ -374,6 +374,30 @@ fmt.Println(err)
 // <nil>
 ```
 
+## Performance
+
+There are some benchmark cases in [./internal/benchmark](./internal/benchmark/). We can enter this directory and run `go test -bench . -benchmem` to see results.
+
+Here is the result running on my dev machine with v1.19.0 as a sample.
+
+```text
+Benchmark_SelectBasic_SQLBuilder-12        1406461      848.1 ns/op     1064 B/op       18 allocs/op
+Benchmark_SelectComplex_SQLBuilder-12       294868       4087 ns/op     3537 B/op       71 allocs/op
+Benchmark_Update_SQLBuilder-12              351915       3172 ns/op     2937 B/op       49 allocs/op
+Benchmark_Delete_SqlBuilder-12              473796       2569 ns/op     2008 B/op       38 allocs/op
+```
+
+As a comparasion, there are cases implemented by [squirrel v1.5.3](https://github.com/Masterminds/squirrel). Here is the result on my dev machine.
+
+```text
+Benchmark_SelectBasic_Squirrel-12           210292       5740 ns/op     3281 B/op       70 allocs/op
+Benchmark_SelectComplex_Squirrel-12         118238      10283 ns/op     6027 B/op      121 allocs/op
+Benchmark_Update_Squirrel-12                 94173      12899 ns/op     7691 B/op      165 allocs/op
+Benchmark_Delete_Squirrel-12                153379       7869 ns/op     4858 B/op      102 allocs/op
+```
+
+It's highly appreciated to contribute more and representative cases.
+
 ## FAQ
 
 ### What's the difference between this package and `squirrel`
diff --git a/go.sum b/go.sum
index a38953e..8682cdb 100644
--- a/go.sum
+++ b/go.sum
@@ -5,28 +5,8 @@ github.com/huandu/go-assert v1.1.5 h1:fjemmA7sSfYHJD7CUqs9qTwwfdNAx7/j2/ZlHXzNB3
 github.com/huandu/go-assert v1.1.5/go.mod h1:yOLvuqZwmcHIC5rIzrBhT7D3Q9c3GFnd0JrPVhn/06U=
 github.com/huandu/xstrings v1.3.2 h1:L18LIDzqlW6xN2rEkpdV8+oL/IXWJ1APd+vsdYy4Wdw=
 github.com/huandu/xstrings v1.3.2/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
-github.com/mattn/goveralls v0.0.7 h1:vzy0i4a2iDzEFMdXIxcanRadkr0FBvSBKUmj0P8SPlQ=
-github.com/mattn/goveralls v0.0.7/go.mod h1:h8b4ow6FxSPMQHF6o2ve3qsclnffZjYTNEKmLesRwqw=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20200522201501-cb1345f3a375 h1:SjQ2+AKWgZLc1xej6WSzL+Dfs5Uyd5xcZH1mGC411IA=
-golang.org/x/tools v0.0.0-20200522201501-cb1345f3a375/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/internal/benchmark/doc.go b/internal/benchmark/doc.go
new file mode 100644
index 0000000..7e8a95a
--- /dev/null
+++ b/internal/benchmark/doc.go
@@ -0,0 +1,5 @@
+// Copyright 2018 Huan Du. All rights reserved.
+// Licensed under the MIT license that can be found in the LICENSE file.
+
+// Package benchmark is to run benchmark test cases against some similar builder packages.
+package benchmark
diff --git a/internal/benchmark/go.mod b/internal/benchmark/go.mod
new file mode 100644
index 0000000..bbe7501
--- /dev/null
+++ b/internal/benchmark/go.mod
@@ -0,0 +1,16 @@
+module github.com/huandu/go-sqlbuilder/benchmark
+
+go 1.19
+
+require (
+	github.com/Masterminds/squirrel v1.5.3
+	github.com/huandu/go-sqlbuilder v1.19.0
+)
+
+require (
+	github.com/huandu/xstrings v1.3.2 // indirect
+	github.com/lann/builder v0.0.0-20180802200727-47ae307949d0 // indirect
+	github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0 // indirect
+)
+
+replace github.com/huandu/go-sqlbuilder => ../..
diff --git a/internal/benchmark/go.sum b/internal/benchmark/go.sum
new file mode 100644
index 0000000..6cc9be6
--- /dev/null
+++ b/internal/benchmark/go.sum
@@ -0,0 +1,22 @@
+github.com/Masterminds/squirrel v1.5.3 h1:YPpoceAcxuzIljlr5iWpNKaql7hLeG1KLSrhvdHpkZc=
+github.com/Masterminds/squirrel v1.5.3/go.mod h1:NNaOrjSoIDfDA40n7sr2tPNZRfjzjA400rg+riTZj10=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/huandu/go-assert v1.1.5 h1:fjemmA7sSfYHJD7CUqs9qTwwfdNAx7/j2/ZlHXzNB3c=
+github.com/huandu/go-assert v1.1.5/go.mod h1:yOLvuqZwmcHIC5rIzrBhT7D3Q9c3GFnd0JrPVhn/06U=
+github.com/huandu/xstrings v1.3.2 h1:L18LIDzqlW6xN2rEkpdV8+oL/IXWJ1APd+vsdYy4Wdw=
+github.com/huandu/xstrings v1.3.2/go.mod h1:y5/lhBue+AyNmUVz9RLU9xbLR0o4KIIExikq4ovT0aE=
+github.com/lann/builder v0.0.0-20180802200727-47ae307949d0 h1:SOEGU9fKiNWd/HOJuq6+3iTQz8KNCLtVX6idSoTLdUw=
+github.com/lann/builder v0.0.0-20180802200727-47ae307949d0/go.mod h1:dXGbAdH5GtBTC4WfIxhKZfyBF/HBFgRZSWwZ9g/He9o=
+github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0 h1:P6pPBnrTSX3DEVR4fDembhRWSsG5rVo6hYhAB/ADZrk=
+github.com/lann/ps v0.0.0-20150810152359-62de8c46ede0/go.mod h1:vmVJ0l/dxyfGW6FmdpVm2joNMFikkuWg0EoCKLGUMNw=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/internal/benchmark/sqlbuilder_test.go b/internal/benchmark/sqlbuilder_test.go
new file mode 100644
index 0000000..42cf3e2
--- /dev/null
+++ b/internal/benchmark/sqlbuilder_test.go
@@ -0,0 +1,78 @@
+package benchmark
+
+import (
+	"testing"
+
+	"github.com/huandu/go-sqlbuilder"
+)
+
+func Benchmark_SelectBasic_SQLBuilder(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		sb := sqlbuilder.Select("*").
+			From("users").
+			Join("emails USING (email_id)")
+		sb.Where(sb.IsNull("deleted_at"))
+		sb.Build()
+	}
+}
+
+func Benchmark_SelectComplex_SQLBuilder(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		sb := sqlbuilder.Select("id", "name")
+		innerSb := sqlbuilder.Select("*").From("banned")
+		innerSb.Where(
+			innerSb.NotIn("name", sqlbuilder.Flatten([]string{"Huan Du", "Charmy Liu"})...),
+		)
+
+		sb.From(
+			sb.BuilderAs(innerSb, "user"),
+		)
+		sb.Where(
+			sb.In("status", sqlbuilder.Flatten([]int{1, 2, 3})...),
+			sb.Between("created_at", 1234567890, 1234599999),
+		)
+		sb.OrderBy("modified_at").Desc()
+
+		sb.Build()
+	}
+}
+
+func Benchmark_Update_SQLBuilder(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		ub := sqlbuilder.Update("demo.user")
+		ub.Set(
+			ub.Assign("type", "sys"),
+			ub.Incr("credit"),
+			"modified_at = UNIX_TIMESTAMP(NOW())",
+		)
+		ub.Where(
+			ub.GreaterThan("id", 1234),
+			ub.Like("name", "%Du"),
+			ub.Or(
+				ub.IsNull("id_card"),
+				ub.In("status", 1, 2, 5),
+			),
+			"modified_at > created_at + "+ub.Var(86400),
+		)
+		ub.OrderBy("id").Asc()
+
+		ub.Build()
+	}
+}
+
+func Benchmark_Delete_SqlBuilder(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		del := sqlbuilder.DeleteFrom("demo.user")
+		del.Where(
+			del.GreaterThan("id", 1234),
+			del.Like("name", "%Du"),
+			del.Or(
+				del.IsNull("id_card"),
+				del.In("status", 1, 2, 5),
+			),
+			"modified_at > created_at + "+del.Var(86400),
+		)
+
+		del.Build()
+	}
+}
diff --git a/internal/benchmark/squirrel_test.go b/internal/benchmark/squirrel_test.go
new file mode 100644
index 0000000..73cb09d
--- /dev/null
+++ b/internal/benchmark/squirrel_test.go
@@ -0,0 +1,65 @@
+package benchmark
+
+import (
+	"testing"
+
+	sq "github.com/Masterminds/squirrel"
+)
+
+func Benchmark_SelectBasic_Squirrel(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		users := sq.Select("*").
+			From("users").
+			Join("emails USING (email_id)").
+			Where(sq.Eq{"deleted_at": nil})
+		users.ToSql()
+	}
+}
+
+func Benchmark_SelectComplex_Squirrel(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		innerSb := sq.Select("*").
+			From("banned").
+			Where("name NOT IN (?, ?)", "Huan Du", "Charmy Liu")
+		sb := sq.Select("id", "name").
+			FromSelect(innerSb, "user").
+			Where("status IN (?, ?, ?)", 1, 2, 3).
+			Where("created_at BETWEEN ? AND ?", 1234567890, 1234599999)
+
+		sb.ToSql()
+	}
+}
+
+func Benchmark_Update_Squirrel(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		ub := sq.Update("demo.user").
+			Set("type", "sys").
+			Set("credit", sq.Expr("credit + 1")).
+			Set("modified_at", sq.Expr("UNIX_TIMESTAMP(NOW())")).
+			Where(sq.Gt{"id": 1234}).
+			Where(sq.Like{"name": "%Du"}).
+			Where(sq.Or{
+				sq.Eq{"id_card": nil},
+				sq.Expr("status IN (?, ?, ?)", 1, 2, 5),
+			}).
+			Where(sq.Expr("modified_at > created_at + ?", 86400)).
+			OrderBy("id ASC")
+
+		ub.ToSql()
+	}
+}
+
+func Benchmark_Delete_Squirrel(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		del := sq.Delete("demo.user").
+			Where(sq.Gt{"id": 1234}).
+			Where(sq.Like{"name": "%Du"}).
+			Where(sq.Or{
+				sq.Eq{"id_card": nil},
+				sq.Expr("status IN (?, ?, ?)", 1, 2, 5),
+			}).
+			Where(sq.Expr("modified_at > created_at + ?", 86400))
+
+		del.ToSql()
+	}
+}