diff --git a/go.mod b/go.mod
index ab67779..f88303a 100644
--- a/go.mod
+++ b/go.mod
@@ -5,15 +5,9 @@ go 1.19
 require (
 	github.com/ncruces/julianday v0.1.5
 	github.com/psanford/httpreadat v0.1.0
-	github.com/stealthrocket/wzprof v0.1.5
 	github.com/tetratelabs/wazero v1.1.1-0.20230522055633-256b7a4bf970
 	golang.org/x/sync v0.2.0
 	golang.org/x/sys v0.8.0
 )
 
-require (
-	github.com/google/pprof v0.0.0-20230510103437-eeec1cb781c3 // indirect
-	golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1 // indirect
-)
-
 retract v0.4.0 // tagged from the wrong branch
diff --git a/go.sum b/go.sum
index 6fc662b..4b6a42d 100644
--- a/go.sum
+++ b/go.sum
@@ -1,15 +1,9 @@
-github.com/google/pprof v0.0.0-20230510103437-eeec1cb781c3 h1:2XF1Vzq06X+inNqgJ9tRnGuw+ZVCB3FazXODD6JE1R8=
-github.com/google/pprof v0.0.0-20230510103437-eeec1cb781c3/go.mod h1:79YE0hCXdHag9sBkw2o+N/YnZtTkXi0UT9Nnixa5eYk=
 github.com/ncruces/julianday v0.1.5 h1:hDJ9ejiMp3DHsoZ5KW4c1lwfMjbARS7u/gbYcd0FBZk=
 github.com/ncruces/julianday v0.1.5/go.mod h1:Dusn2KvZrrovOMJuOt0TNXL6tB7U2E8kvza5fFc9G7g=
 github.com/psanford/httpreadat v0.1.0 h1:VleW1HS2zO7/4c7c7zNl33fO6oYACSagjJIyMIwZLUE=
 github.com/psanford/httpreadat v0.1.0/go.mod h1:Zg7P+TlBm3bYbyHTKv/EdtSJZn3qwbPwpfZ/I9GKCRE=
-github.com/stealthrocket/wzprof v0.1.5 h1:Y3jQHvdGFQMySV2VIjJhBu08OdcqcflfTz7CvrH5MGM=
-github.com/stealthrocket/wzprof v0.1.5/go.mod h1:hqLzj5iDSncc6rlPMhC51O642AkaC+dWVPNNalZdlCY=
 github.com/tetratelabs/wazero v1.1.1-0.20230522055633-256b7a4bf970 h1:X5OOeHRjoLA8XhVc7biEbh1/hnTzpYpPn7HuyarMslQ=
 github.com/tetratelabs/wazero v1.1.1-0.20230522055633-256b7a4bf970/go.mod h1:wYx2gNRg8/WihJfSDxA1TIL8H+GkfLYm+bIfbblu9VQ=
-golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1 h1:k/i9J1pBpvlfR+9QsetwPyERsqu1GIbi967PQMq3Ivc=
-golang.org/x/exp v0.0.0-20230522175609-2e198f4a06a1/go.mod h1:V1LtkGg67GoY2N1AnLN78QLrzxkLyJw7RJb1gzOOz9w=
 golang.org/x/sync v0.2.0 h1:PUR+T4wwASmuSTYdKjYHI5TD22Wy5ogLU5qZCOLxBrI=
 golang.org/x/sync v0.2.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
diff --git a/vfs/tests/mptest/mptest_test.go b/vfs/tests/mptest/mptest_test.go
index e9670e2..b64fb77 100644
--- a/vfs/tests/mptest/mptest_test.go
+++ b/vfs/tests/mptest/mptest_test.go
@@ -35,7 +35,7 @@ var (
 	instances atomic.Uint64
 )
 
-func init() {
+func TestMain(m *testing.M) {
 	ctx := context.TODO()
 
 	rt = wazero.NewRuntime(ctx)
@@ -52,6 +52,8 @@ func init() {
 	if err != nil {
 		panic(err)
 	}
+
+	os.Exit(m.Run())
 }
 
 func config(ctx context.Context) wazero.ModuleConfig {
diff --git a/vfs/tests/speedtest1/speedtest1_test.go b/vfs/tests/speedtest1/speedtest1_test.go
index 1166b12..6c12348 100644
--- a/vfs/tests/speedtest1/speedtest1_test.go
+++ b/vfs/tests/speedtest1/speedtest1_test.go
@@ -6,7 +6,6 @@ import (
 	"crypto/rand"
 	"flag"
 	"io"
-	"log"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -16,9 +15,7 @@ import (
 
 	_ "embed"
 
-	"github.com/stealthrocket/wzprof"
 	"github.com/tetratelabs/wazero"
-	"github.com/tetratelabs/wazero/experimental"
 	"github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1"
 
 	"github.com/ncruces/go-sqlite3/vfs"
@@ -33,16 +30,12 @@ var (
 	module  wazero.CompiledModule
 	output  bytes.Buffer
 	options []string
-	cpuprof string
-	memprof string
 )
 
 func TestMain(m *testing.M) {
 	initFlags()
 
 	ctx := context.Background()
-	ctx, prof, cpu, mem := setupProfiling(ctx)
-
 	rt = wazero.NewRuntime(ctx)
 	wasi_snapshot_preview1.MustInstantiate(ctx, rt)
 	env := vfs.ExportHostFunctions(rt.NewHostModuleBuilder("env"))
@@ -59,12 +52,10 @@ func TestMain(m *testing.M) {
 	code := m.Run()
 	defer os.Exit(code)
 	io.Copy(os.Stderr, &output)
-	saveProfiles(module, prof, cpu, mem)
 }
 
 func initFlags() {
 	i := 1
-	wzprof := false
 	options = append(options, "speedtest1")
 	for _, arg := range os.Args[1:] {
 		switch {
@@ -72,9 +63,6 @@ func initFlags() {
 			// keep test flags
 			os.Args[i] = arg
 			i++
-		case strings.HasSuffix(arg, "-wzprof"):
-			// collect guest profile
-			wzprof = true
 		default:
 			// collect everything else
 			options = append(options, arg)
@@ -82,71 +70,6 @@ func initFlags() {
 	}
 	os.Args = os.Args[:i]
 	flag.Parse()
-
-	if wzprof {
-		var f *flag.Flag
-		f = flag.Lookup("test.cpuprofile")
-		cpuprof = f.Value.String()
-		f.Value.Set("")
-		f = flag.Lookup("test.memprofile")
-		memprof = f.Value.String()
-		f.Value.Set("")
-	}
-}
-
-func setupProfiling(ctx context.Context) (context.Context, *wzprof.Profiling, *wzprof.CPUProfiler, *wzprof.MemoryProfiler) {
-	if cpuprof == "" && memprof == "" {
-		return ctx, nil, nil, nil
-	}
-
-	var cpu *wzprof.CPUProfiler
-	var mem *wzprof.MemoryProfiler
-	prof := wzprof.ProfilingFor(binary)
-
-	var listeners []experimental.FunctionListenerFactory
-	if cpuprof != "" {
-		cpu = prof.CPUProfiler()
-		listeners = append(listeners, cpu)
-		cpu.StartProfile()
-	}
-	if memprof != "" {
-		mem = prof.MemoryProfiler()
-		listeners = append(listeners, mem)
-	}
-	if listeners != nil {
-		ctx = context.WithValue(ctx,
-			experimental.FunctionListenerFactoryKey{},
-			experimental.MultiFunctionListenerFactory(listeners...))
-	}
-	return ctx, prof, cpu, mem
-}
-
-func saveProfiles(module wazero.CompiledModule, prof *wzprof.Profiling, cpu *wzprof.CPUProfiler, mem *wzprof.MemoryProfiler) {
-	if cpu == nil && mem == nil {
-		return
-	}
-
-	log.SetOutput(io.Discard)
-	err := prof.Prepare(module)
-	if err != nil {
-		panic(err)
-	}
-
-	if cpu != nil {
-		prof := cpu.StopProfile(1)
-		err := wzprof.WriteProfile(cpuprof, prof)
-		if err != nil {
-			panic(err)
-		}
-	}
-
-	if mem != nil {
-		prof := mem.NewProfile(1)
-		err := wzprof.WriteProfile(memprof, prof)
-		if err != nil {
-			panic(err)
-		}
-	}
 }
 
 func Benchmark_speedtest1(b *testing.B) {