diff --git a/go/check b/go/check
index 6ceeb239a..b2b9bc50a 100755
--- a/go/check
+++ b/go/check
@@ -2,5 +2,6 @@
 
 u/try-io    > u/try-io.out
 u/try-chain > u/try-chain.out
+u/try-verbs > u/try-verbs.out
 u/try-parse > u/try-parse.out
 u/try-cst   > u/try-cst.out
diff --git a/go/src/miller/cli/mlrcli_mappers.go b/go/src/miller/cli/mlrcli_mappers.go
index 1a591238c..f249396c2 100644
--- a/go/src/miller/cli/mlrcli_mappers.go
+++ b/go/src/miller/cli/mlrcli_mappers.go
@@ -12,6 +12,7 @@ import (
 // ----------------------------------------------------------------
 var MAPPER_LOOKUP_TABLE = []mapping.MapperSetup{
 	mappers.CatSetup,
+	mappers.CutSetup,
 	mappers.NothingSetup,
 	mappers.PutSetup,
 	mappers.TacSetup,
diff --git a/go/src/miller/cli/mlrcli_parse.go b/go/src/miller/cli/mlrcli_parse.go
index 72eadd0e1..ac35388b6 100644
--- a/go/src/miller/cli/mlrcli_parse.go
+++ b/go/src/miller/cli/mlrcli_parse.go
@@ -466,16 +466,16 @@ func parseReaderOptions(args []string, argc int, pargi *int, readerOptions *clit
 		//		readerOptions.allow_repeat_ifs = true;
 		//		argi += 1;
 		//
-		//	} else if args[argi] == "--mmap" {
-		//		// No-op as of 5.6.3 (mmap is being abandoned) but don't break
-		//		// the command-line user experience.
-		//		argi += 1;
-		//
-		//	} else if args[argi] == "--no-mmap" {
-		//		// No-op as of 5.6.3 (mmap is being abandoned) but don't break
-		//		// the command-line user experience.
-		//		argi += 1;
-		//
+	} else if args[argi] == "--mmap" {
+		// No-op as of 5.6.3 (mmap is being abandoned) but don't break
+		// the command-line user experience.
+		argi += 1
+
+	} else if args[argi] == "--no-mmap" {
+		// No-op as of 5.6.3 (mmap is being abandoned) but don't break
+		// the command-line user experience.
+		argi += 1
+
 		//	} else if args[argi] == "--prepipe" {
 		//		checkArgCount(args, argi, argc, 2);
 		//		readerOptions.prepipe = args[argi+1];
diff --git a/go/src/miller/containers/lrec.go b/go/src/miller/containers/lrec.go
index ebe59b407..ae02f2bc2 100644
--- a/go/src/miller/containers/lrec.go
+++ b/go/src/miller/containers/lrec.go
@@ -67,7 +67,7 @@ type lrecEntry struct {
 }
 
 // ----------------------------------------------------------------
-func LrecAlloc() *Lrec {
+func NewLrec() *Lrec {
 	return &Lrec{
 		0,
 		nil,
@@ -76,7 +76,10 @@ func LrecAlloc() *Lrec {
 }
 
 // ----------------------------------------------------------------
-func (this *Lrec) Print(file *os.File) {
+func (this *Lrec) Print() {
+	this.Fprint(os.Stdout)
+}
+func (this *Lrec) Fprint(file *os.File) {
 	var buffer bytes.Buffer // 5x faster than fmt.Print() separately
 	for pe := this.Head; pe != nil; pe = pe.Next {
 		buffer.WriteString(*pe.Key)
@@ -101,6 +104,11 @@ func lrecEntryAlloc(key *string, value *lib.Mlrval) *lrecEntry {
 	}
 }
 
+// ----------------------------------------------------------------
+func (this *Lrec) Has(key *string) bool {
+	return this.findEntry(key) != nil
+}
+
 // ----------------------------------------------------------------
 func (this *Lrec) findEntry(key *string) *lrecEntry {
 	for pe := this.Head; pe != nil; pe = pe.Next {
@@ -171,14 +179,49 @@ func (this *Lrec) Clear() {
 	this.Tail = nil
 }
 
+// ----------------------------------------------------------------
 func (this *Lrec) Copy() *Lrec {
-	that := LrecAlloc()
+	that := NewLrec()
 	for pe := this.Head; pe != nil; pe = pe.Next {
 		that.Put(pe.Key, pe.Value)
 	}
 	return that
 }
 
+// ----------------------------------------------------------------
+// Returns true if it was found and removed
+func (this *Lrec) Remove(key *string) bool {
+	pe := this.findEntry(key)
+	if pe == nil {
+		return false
+	} else {
+		this.unlink(pe)
+		return true
+	}
+}
+
+// ----------------------------------------------------------------
+func (this *Lrec) unlink(pe *lrecEntry) {
+	if pe == this.Head {
+		if pe == this.Tail {
+			this.Head = nil
+			this.Tail = nil
+		} else {
+			this.Head = pe.Next
+			pe.Next.Prev = nil
+		}
+	} else {
+		pe.Prev.Next = pe.Next
+		if pe == this.Tail {
+			this.Tail = pe.Prev
+		} else {
+			pe.Next.Prev = pe.Prev
+		}
+	}
+	this.FieldCount--
+}
+
+// ----------------------------------------------------------------
 //void lrec_prepend(Lrec* prec, char* key, char* value, char free_flags) {
 //	lrecEntry* pe = lrec_find_entry(prec, key);
 //
@@ -501,27 +544,6 @@ func (this *Lrec) Copy() *Lrec {
 //		pe->free_flags &= ~FREE_ENTRY_VALUE;
 //}
 
-//// ----------------------------------------------------------------
-//void lrec_unlink(Lrec* prec, lrecEntry* pe) {
-//	if (pe == prec->Head) {
-//		if (pe == prec->Tail) {
-//			prec->Head = NULL;
-//			prec->Tail = NULL;
-//		} else {
-//			prec->Head = pe->Next;
-//			pe->Next->Prev = NULL;
-//		}
-//	} else {
-//		pe->Prev->Next = pe->Next;
-//		if (pe == prec->Tail) {
-//			prec->Tail = pe->Prev;
-//		} else {
-//			pe->Next->Prev = pe->Prev;
-//		}
-//	}
-//	prec->field_count--;
-//}
-
 //// ----------------------------------------------------------------
 //static void lrec_link_at_head(Lrec* prec, lrecEntry* pe) {
 //
diff --git a/go/src/miller/dsl/cst/collections.go b/go/src/miller/dsl/cst/collections.go
index ead5e0654..735135950 100644
--- a/go/src/miller/dsl/cst/collections.go
+++ b/go/src/miller/dsl/cst/collections.go
@@ -115,8 +115,7 @@ func BuildMapLiteralNode(
 
 	// TODO
 
-	return &MapLiteralNode{
-	}, nil
+	return &MapLiteralNode{}, nil
 }
 
 func (this *MapLiteralNode) Evaluate(state *State) lib.Mlrval {
diff --git a/go/src/miller/input/record_reader_csv.go b/go/src/miller/input/record_reader_csv.go
index e5dae47c8..bbb50c406 100644
--- a/go/src/miller/input/record_reader_csv.go
+++ b/go/src/miller/input/record_reader_csv.go
@@ -87,7 +87,7 @@ func (this *RecordReaderCSV) processHandle(
 			return
 		}
 
-		lrec := containers.LrecAlloc()
+		lrec := containers.NewLrec()
 
 		// TODO: check for length mismatches
 		n := len(header)
diff --git a/go/src/miller/input/record_reader_dkvp.go b/go/src/miller/input/record_reader_dkvp.go
index e36abc9d5..866d7280a 100644
--- a/go/src/miller/input/record_reader_dkvp.go
+++ b/go/src/miller/input/record_reader_dkvp.go
@@ -86,7 +86,7 @@ func lrecFromDKVPLine(
 	ifs *string,
 	ips *string,
 ) *containers.Lrec {
-	lrec := containers.LrecAlloc()
+	lrec := containers.NewLrec()
 	pairs := strings.Split(*line, *ifs)
 	for _, pair := range pairs {
 		kv := strings.SplitN(pair, *ips, 2)
diff --git a/go/src/miller/input/record_reader_json.go b/go/src/miller/input/record_reader_json.go
index 40fb10b67..91f636c47 100644
--- a/go/src/miller/input/record_reader_json.go
+++ b/go/src/miller/input/record_reader_json.go
@@ -70,7 +70,7 @@ func (this *RecordReaderJSON) processHandle(
 
 	for jsonDecoder.More() {
 
-		lrec := containers.LrecAlloc()
+		lrec := containers.NewLrec()
 
 		var om *ordered.OrderedMap = ordered.NewOrderedMap()
 		err := jsonDecoder.Decode(om)
diff --git a/go/src/miller/input/record_reader_nidx.go b/go/src/miller/input/record_reader_nidx.go
index 3b8437762..9de69eeeb 100644
--- a/go/src/miller/input/record_reader_nidx.go
+++ b/go/src/miller/input/record_reader_nidx.go
@@ -88,7 +88,7 @@ func (this *RecordReaderNIDX) processHandle(
 func lrecFromNIDXLine(
 	line *string,
 ) *containers.Lrec {
-	lrec := containers.LrecAlloc()
+	lrec := containers.NewLrec()
 	values := strings.Split(*line, " ") // TODO: repifs ...
 	var i int64 = 0
 	for _, value := range values {
diff --git a/perf/Makefile.no-autoconfig b/perf/Makefile.no-autoconfig
index 053c9582b..377ecd4a9 100644
--- a/perf/Makefile.no-autoconfig
+++ b/perf/Makefile.no-autoconfig
@@ -1,4 +1,5 @@
-all: catc catc0 catm catd catrust catgo catnim cutd cutgo cutnim
+all: catc catc0 catm catrust catgo catnim cutgo cutnim
+# catd cutd
 allc: catc catc0 catm
 
 catc: catc.c
@@ -7,16 +8,16 @@ catc0: catc0.c
 	gcc -Wall catc0.c -o catc0
 catm: catm.c
 	gcc -Wall catm.c -o catm
-catd: catd.d
-	dmd -O catd.d
+#catd: catd.d
+#	dmd -O catd.d
 catrust: catrust.rs
 	rustc catrust.rs
 catgo: catgo.go
 	go build catgo.go
 catnim: catnim.nim
 	nim compile catnim.nim
-cutd: cutd.d
-	dmd -O cutd.d
+#cutd: cutd.d
+#	dmd -O cutd.d
 cutgo: cutgo.go
 	go build cutgo.go
 cutnim: cutnim.nim
diff --git a/perf/catgo.go b/perf/catgo.go
index 7b01385d1..6521c3a99 100644
--- a/perf/catgo.go
+++ b/perf/catgo.go
@@ -10,14 +10,13 @@ import (
 // ----------------------------------------------------------------
 func main() {
 	args := os.Args[1:]
-	includeFields := []string {"a", "x"};
 
 	ok := true
 	if len(args) == 0 {
-		ok = handle("-", includeFields) && ok
+		ok = handle("-") && ok
 	} else {
 		for _, arg := range args {
-			ok = handle(arg, includeFields) && ok
+			ok = handle(arg) && ok
 		}
 	}
 	if ok {
@@ -28,7 +27,7 @@ func main() {
 }
 
 // ----------------------------------------------------------------
-func handle(fileName string, includeFields []string) (ok bool) {
+func handle(fileName string) (ok bool) {
 	inputStream := os.Stdin
 	if fileName != "-" {
 		var err error
diff --git a/perf/catgo2.go b/perf/catgo2.go
index 5c4b3668d..db3f8f7f8 100644
--- a/perf/catgo2.go
+++ b/perf/catgo2.go
@@ -10,14 +10,13 @@ import (
 // ----------------------------------------------------------------
 func main() {
 	args := os.Args[1:]
-	includeFields := []string {"a", "x"};
 
 	ok := true
 	if len(args) == 0 {
-		ok = handle("-", includeFields) && ok
+		ok = handle("-") && ok
 	} else {
 		for _, arg := range args {
-			ok = handle(arg, includeFields) && ok
+			ok = handle(arg) && ok
 		}
 	}
 	if ok {
@@ -28,7 +27,7 @@ func main() {
 }
 
 // ----------------------------------------------------------------
-func handle(fileName string, includeFields []string) (ok bool) {
+func handle(fileName string) (ok bool) {
 	inputStream := os.Stdin
 	if fileName != "-" {
 		var err error
diff --git a/perf/cutgo.go b/perf/cutgo.go
index 56ec3be75..b5985c8db 100644
--- a/perf/cutgo.go
+++ b/perf/cutgo.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"bufio"
+	"bytes"
 	"io"
 	"log"
 	"os"
@@ -10,14 +11,14 @@ import (
 
 // ----------------------------------------------------------------
 func main() {
-	args := os.Args[1:]
-	includeFields := []string {"a", "x"};
+	includeFields := strings.Split(os.Args[1], ",")
+	filenames := os.Args[2:]
 
 	ok := true
-	if len(args) == 0 {
+	if len(filenames) == 0 {
 		ok = handle("-", includeFields) && ok
 	} else {
-		for _, arg := range args {
+		for _, arg := range filenames {
 			ok = handle(arg, includeFields) && ok
 		}
 	}
@@ -40,7 +41,6 @@ func handle(fileName string, includeFields []string) (ok bool) {
 	}
 
 	reader := bufio.NewReader(inputStream)
-	writer := bufio.NewWriter(os.Stdout)
 	eof := false
 
 	for !eof {
@@ -56,59 +56,148 @@ func handle(fileName string, includeFields []string) (ok bool) {
 			return false
 		} else {
 
-			// 0.030s
+			// continue
+			// $ repeat 10 justtime cutgo ccode,milex,year,cinc ../c/nmc1.dkvp > /dev/null
+			// TIME IN SECONDS 0.228 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 0.226 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 0.222 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 0.221 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 0.228 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 0.226 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 0.225 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 0.227 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 0.222 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 0.223 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			//
+			// avg 0.2248
+			// cumu  4%
 
 			// Line to map
 			mymap := make(map[string]string)
-			fields := strings.Split(line, ",");
-			for _, field := range(fields) {
+			fields := strings.Split(line, ",")
+			for _, field := range fields {
 				kvps := strings.SplitN(field, "=", 2)
 				mymap[kvps[0]] = kvps[1]
 			}
-			// 0.220s
-			// delta 0.190s
-			// 27%
+
+			// continue
+			// $ repeat 10 justtime cutgo ccode,milex,year,cinc ../c/nmc1.dkvp > /dev/null
+			// TIME IN SECONDS 3.055 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.837 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.905 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.817 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.766 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.810 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.748 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.744 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.765 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.722 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			//
+			// avg 2.8169
+			// cumu 58%
+			// delta 54%
 
 			// Map-to-map transform
 			newmap := make(map[string]string)
-			for _, includeField := range(includeFields) {
+			for _, includeField := range includeFields {
 				value, present := mymap[includeField]
 				if present {
 					newmap[includeField] = value
 				}
 			}
-			// 0.280s
-			// delta 0.060s
-			// 9%
+
+			// continue
+			// $ repeat 10 justtime cutgo ccode,milex,year,cinc ../c/nmc1.dkvp > /dev/null
+			// TIME IN SECONDS 3.101 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.028 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.992 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.005 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.991 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.986 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.992 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.992 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.989 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 2.991 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			//
+			// avg 3.0067
+			// cumu 62%
+			// delta  4%
 
 			// Map to string
-			outs := make([]string, len(newmap))
+
+			// Faster to assemble in memory with single fmt.Println at the end,
+			// than multiple fmt.Print through the fields.
+			var buffer bytes.Buffer
 			i := 0
-			for k, v := range(newmap) {
-				outs[i] = k + "=" + v
+			for k, v := range newmap {
+				if i > 0 {
+					buffer.WriteString(",")
+				}
+				buffer.WriteString(k)
+				buffer.WriteString("=")
+				buffer.WriteString(v)
 				i++
 			}
-			// 0.320s
-			// delta 0.040s
-			// 6%
 
-			out := strings.Join(outs, ",")
-			// 0.330s
-			// delta 0.010s
-			// 2%
+			// continue
+			// $ repeat 10 justtime cutgo ccode,milex,year,cinc ../c/nmc1.dkvp > /dev/null
+			// TIME IN SECONDS 3.821 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.443 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.491 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.421 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.412 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.470 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.438 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.555 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.637 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.538 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			//
+			// avg 3.5226
+			// cumu 73%
+			// delta 11%
 
-			// Write to output stream
-			//fmt.Println("")
-			writer.WriteString(out)
-			// delta 0.390s
-			// 56%
+			buffer.WriteString("\n")
+
+			// continue
+			// $ repeat 10 justtime cutgo ccode,milex,year,cinc ../c/nmc1.dkvp > /dev/null
+			// TIME IN SECONDS 3.769 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.539 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.539 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.486 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.518 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.492 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.506 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.486 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.495 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 3.560 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			//
+			// avg 3.539
+			// cumu 73%
+			// delta  0%
+
+			os.Stdout.WriteString(buffer.String())
+
+			// $ repeat 10 justtime cutgo ccode,milex,year,cinc ../c/nmc1.dkvp > /dev/null
+			// TIME IN SECONDS 4.976 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 4.727 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 4.760 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 4.747 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 4.826 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 4.849 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 4.841 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 4.747 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 4.841 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			// TIME IN SECONDS 4.765 -- cutgo ccode,milex,year,cinc ../c/nmc1.dkvp
+			//
+			// avg 4.8079
+			// cumu 100%
+			// delta 27%
 
 		}
 	}
 	if fileName != "-" {
 		inputStream.Close()
 	}
-	writer.Flush()
 
 	return true
 }
diff --git a/perf/do-timings.rb b/perf/do-timings.rb
index fe650b3ab..f5b20357b 100755
--- a/perf/do-timings.rb
+++ b/perf/do-timings.rb
@@ -28,10 +28,13 @@ run("catc0",     "catc0                 ../data/big.dkvp > /dev/null")
 run("catc",      "catc                < ../data/big.dkvp > /dev/null")
 run("catc",      "catc                  ../data/big.dkvp > /dev/null")
 run("catm",      "catm                  ../data/big.dkvp > /dev/null")
+run("catgo",     "catgo                  ../data/big.dkvp > /dev/null")
 run("catawk",    "awk -F, '{print}'     ../data/big.dkvp > /dev/null")
 run("catmawk",   "mawk -F, '{print}'     ../data/big.dkvp > /dev/null")
-run("CATMLR",    "mlr --no-mmap cat     ../data/big.dkvp > /dev/null")
-run("CATMLRM",   "mlr --mmap cat        ../data/big.dkvp > /dev/null")
+run("CATMLR",    "../c/mlr --no-mmap cat     ../data/big.dkvp > /dev/null")
+run("CATMLRM",   "../c/mlr --mmap cat        ../data/big.dkvp > /dev/null")
+run("CATMLR",    "../go/mlr --no-mmap cat     ../data/big.dkvp > /dev/null")
+run("CATMLRM",   "../go/mlr --mmap cat        ../data/big.dkvp > /dev/null")
 puts
 
 run("(catv)",    "cat                        < ../data/big.csv > /dev/null")
@@ -40,12 +43,13 @@ run("catc0v",    "catc0                        ../data/big.csv > /dev/null")
 run("catcv",     "catc                       < ../data/big.csv > /dev/null")
 run("catcv",     "catc                         ../data/big.csv > /dev/null")
 run("catmv",     "catm                         ../data/big.csv > /dev/null")
+run("catgov",    "catgo                         ../data/big.csv > /dev/null")
 run("catawkv",   "awk -F, '{print}'            ../data/big.csv > /dev/null")
 run("catmawkv",  "mawk -F, '{print}'            ../data/big.csv > /dev/null")
-run("CATMLRV",   "mlr --no-mmap --csv --rs lf cat  ../data/big.csv > /dev/null")
-run("CATMLRVM",  "mlr --mmap --csv --rs lf cat     ../data/big.csv > /dev/null")
-run("CATMLRV",   "mlr --no-mmap --csvlite cat      ../data/big.csv > /dev/null")
-run("CATMLRVM",  "mlr --mmap --csvlite cat         ../data/big.csv > /dev/null")
+run("CATMLRV",   "../c/mlr --no-mmap --csv --rs lf cat  ../data/big.csv > /dev/null")
+run("CATMLRVM",  "../c/mlr --mmap --csv --rs lf cat     ../data/big.csv > /dev/null")
+run("CATMLRV",   "../c/mlr --no-mmap --csvlite cat      ../data/big.csv > /dev/null")
+run("CATMLRVM",  "../c/mlr --mmap --csvlite cat         ../data/big.csv > /dev/null")
 puts
 puts