diff --git a/cli/startup_data.rs b/cli/startup_data.rs
index 62a54d8564717a..1a77915e9004fc 100644
--- a/cli/startup_data.rs
+++ b/cli/startup_data.rs
@@ -11,8 +11,8 @@ pub fn deno_isolate_init() -> StartupData<'static> {
     let source_bytes = vec![];
 
     StartupData::Script(Script {
-      filename: "gen/cli/bundle/main.js".to_string(),
-      source: std::str::from_utf8(&source_bytes[..]).unwrap().to_string(),
+      filename: "gen/cli/bundle/main.js",
+      source: std::str::from_utf8(&source_bytes[..]).unwrap(),
     })
   } else {
     debug!("Deno isolate init with snapshots.");
@@ -38,8 +38,8 @@ pub fn compiler_isolate_init() -> StartupData<'static> {
     let source_bytes = vec![];
 
     StartupData::Script(Script {
-      filename: "gen/cli/bundle/compiler.js".to_string(),
-      source: std::str::from_utf8(&source_bytes[..]).unwrap().to_string(),
+      filename: "gen/cli/bundle/compiler.js",
+      source: std::str::from_utf8(&source_bytes[..]).unwrap(),
     })
   } else {
     debug!("Deno isolate init with snapshots.");
diff --git a/core/http_bench.rs b/core/http_bench.rs
index cb4e0ac50a49d4..fced92bf837174 100644
--- a/core/http_bench.rs
+++ b/core/http_bench.rs
@@ -163,8 +163,8 @@ fn main() {
     let js_source = include_str!("http_bench.js");
 
     let startup_data = StartupData::Script(Script {
-      source: js_source.to_string(),
-      filename: "http_bench.js".to_string(),
+      source: js_source,
+      filename: "http_bench.js",
     });
 
     let isolate = deno::Isolate::new(startup_data, HttpBench());
diff --git a/core/isolate.rs b/core/isolate.rs
index 938c0c63149ea8..88f42be0e941b9 100644
--- a/core/isolate.rs
+++ b/core/isolate.rs
@@ -51,16 +51,16 @@ impl Future for PendingOp {
 }
 
 /// Stores a script used to initalize a Isolate
-pub struct Script {
-  pub source: String,
-  pub filename: String,
+pub struct Script<'a> {
+  pub source: &'a str,
+  pub filename: &'a str,
 }
 
 /// Represents data used to initialize isolate at startup
 /// either a binary snapshot or a javascript source file
 /// in the form of the StartupScript struct.
 pub enum StartupData<'a> {
-  Script(Script),
+  Script(Script<'a>),
   Snapshot(&'a [u8]),
   None,
 }
@@ -149,9 +149,7 @@ impl<B: Behavior> Isolate<B> {
 
     // If we want to use execute this has to happen here sadly.
     if let Some(s) = startup_script {
-      core_isolate
-        .execute(s.filename.as_str(), s.source.as_str())
-        .unwrap()
+      core_isolate.execute(s.filename, s.source).unwrap()
     };
 
     core_isolate