diff --git a/rewriter/Cargo.lock b/rewriter/Cargo.lock
index c852b67..a375df0 100644
--- a/rewriter/Cargo.lock
+++ b/rewriter/Cargo.lock
@@ -469,7 +469,6 @@ dependencies = [
  "serde",
  "serde-wasm-bindgen",
  "url",
- "urlencoding",
  "wasm-bindgen",
 ]
 
@@ -718,12 +717,6 @@ dependencies = [
  "percent-encoding",
 ]
 
-[[package]]
-name = "urlencoding"
-version = "2.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
-
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.92"
diff --git a/rewriter/Cargo.toml b/rewriter/Cargo.toml
index 9d3364a..e433f0d 100644
--- a/rewriter/Cargo.toml
+++ b/rewriter/Cargo.toml
@@ -17,5 +17,4 @@ oxc_syntax = "0.20.0"
 serde = "1.0.204"
 serde-wasm-bindgen = "0.6.5"
 url = "2.5.2"
-urlencoding = "2.1.3"
 wasm-bindgen =  "0.2.92"
diff --git a/rewriter/build.sh b/rewriter/build.sh
index 58c1620..0f13bad 100644
--- a/rewriter/build.sh
+++ b/rewriter/build.sh
@@ -1,6 +1,5 @@
-RUSTFLAGS='-C target-feature=+atomics,+bulk-memory,+simd128' cargo build --lib --target wasm32-unknown-unknown -Z build-std=panic_abort,std --release
+RUSTFLAGS='-C target-feature=+atomics,+bulk-memory' cargo build --lib --target wasm32-unknown-unknown -Z build-std=panic_abort,std --release
 wasm-bindgen --weak-refs --target web --out-dir out/ target/wasm32-unknown-unknown/release/rewriter.wasm
-# wasm-bindgen --keep-debug --weak-refs --target web --out-dir out/ target/wasm32-unknown-unknown/release/rewriter.wasm
 
 sed -i 's/import.meta.url/""/g' out/rewriter.js
 
diff --git a/rewriter/src/lib.rs b/rewriter/src/lib.rs
index 30e2962..12919a9 100644
--- a/rewriter/src/lib.rs
+++ b/rewriter/src/lib.rs
@@ -2,6 +2,7 @@ pub mod rewrite;
 
 use std::{panic, str::FromStr};
 
+use js_sys::encode_uri_component;
 use rewrite::rewrite;
 use url::Url;
 use wasm_bindgen::prelude::*;
@@ -12,6 +13,11 @@ extern "C" {
     fn log(s: &str);
 }
 
+// import the SCRAM!!! jet encoder here later
+fn encode(s: String) -> String {
+    encode_uri_component(&s).into()
+}
+
 #[wasm_bindgen]
 pub fn init() {
     panic::set_hook(Box::new(console_error_panic_hook::hook));
@@ -19,7 +25,7 @@ pub fn init() {
 
 #[wasm_bindgen]
 pub fn rewrite_js(js: &str, url: &str) -> Vec<u8> {
-    rewrite(js, Url::from_str(url).unwrap())
+    rewrite(js, Url::from_str(url).unwrap(), Box::new(encode))
 }
 
 #[wasm_bindgen]
@@ -28,5 +34,5 @@ pub fn rewrite_js_from_arraybuffer(js: &[u8], url: &str) -> Vec<u8> {
 
     let js = unsafe { std::str::from_utf8_unchecked(js) };
 
-    rewrite(js, Url::from_str(url).unwrap())
+    rewrite(js, Url::from_str(url).unwrap(), Box::new(encode))
 }
diff --git a/rewriter/src/main.rs b/rewriter/src/main.rs
index dde40c8..585c5fa 100644
--- a/rewriter/src/main.rs
+++ b/rewriter/src/main.rs
@@ -1,5 +1,6 @@
 #![allow(clippy::print_stdout)]
 use std::{
+    borrow::Cow,
     env,
     path::Path,
     str::{from_utf8, FromStr},
@@ -15,6 +16,91 @@ use url::Url;
 // run `cargo run -p oxc_parser --example visitor`
 // or `cargo watch -x "run -p oxc_parser --example visitor"`
 
+/// Percent-encodes every byte except alphanumerics and `-`, `_`, `.`, `~`. Assumes UTF-8 encoding.
+///
+/// Call `.into_owned()` if you need a `String`
+#[inline(always)]
+#[must_use]
+pub fn encode(data: &str) -> Cow<'_, str> {
+    encode_binary(data.as_bytes())
+}
+
+/// Percent-encodes every byte except alphanumerics and `-`, `_`, `.`, `~`.
+#[inline]
+#[must_use]
+pub fn encode_binary(data: &[u8]) -> Cow<'_, str> {
+    // add maybe extra capacity, but try not to exceed allocator's bucket size
+    let mut escaped = String::new();
+    let _ = escaped.try_reserve(data.len() | 15);
+    let unmodified = append_string(data, &mut escaped, true);
+    if unmodified {
+        return Cow::Borrowed(unsafe {
+            // encode_into has checked it's ASCII
+            std::str::from_utf8_unchecked(data)
+        });
+    }
+    Cow::Owned(escaped)
+}
+
+fn append_string(data: &[u8], escaped: &mut String, may_skip: bool) -> bool {
+    encode_into(data, may_skip, |s| {
+        escaped.push_str(s);
+        Ok::<_, std::convert::Infallible>(())
+    })
+    .unwrap()
+}
+
+fn encode_into<E>(
+    mut data: &[u8],
+    may_skip_write: bool,
+    mut push_str: impl FnMut(&str) -> Result<(), E>,
+) -> Result<bool, E> {
+    let mut pushed = false;
+    loop {
+        // Fast path to skip over safe chars at the beginning of the remaining string
+        let ascii_len = data.iter()
+            .take_while(|&&c| matches!(c, b'0'..=b'9' | b'A'..=b'Z' | b'a'..=b'z' |  b'-' | b'.' | b'_' | b'~')).count();
+
+        let (safe, rest) = if ascii_len >= data.len() {
+            if !pushed && may_skip_write {
+                return Ok(true);
+            }
+            (data, &[][..]) // redundatnt to optimize out a panic in split_at
+        } else {
+            data.split_at(ascii_len)
+        };
+        pushed = true;
+        if !safe.is_empty() {
+            push_str(unsafe { std::str::from_utf8_unchecked(safe) })?;
+        }
+        if rest.is_empty() {
+            break;
+        }
+
+        match rest.split_first() {
+            Some((byte, rest)) => {
+                let enc = &[b'%', to_hex_digit(byte >> 4), to_hex_digit(byte & 15)];
+                push_str(unsafe { std::str::from_utf8_unchecked(enc) })?;
+                data = rest;
+            }
+            None => break,
+        };
+    }
+    Ok(false)
+}
+
+#[inline]
+fn to_hex_digit(digit: u8) -> u8 {
+    match digit {
+        0..=9 => b'0' + digit,
+        10..=255 => b'A' - 10 + digit,
+    }
+}
+
+fn encode_string(s: String) -> String {
+    encode(&s).to_string()
+}
+
 fn main() -> std::io::Result<()> {
     let name = env::args().nth(1).unwrap_or_else(|| "test.js".to_string());
     let path = Path::new(&name);
@@ -25,7 +111,8 @@ fn main() -> std::io::Result<()> {
         from_utf8(
             rewrite(
                 &source_text,
-                Url::from_str("https://google.com/glorngle/si.js").unwrap()
+                Url::from_str("https://google.com/glorngle/si.js").unwrap(),
+                Box::new(encode_string)
             )
             .as_slice()
         )
diff --git a/rewriter/src/rewrite.rs b/rewriter/src/rewrite.rs
index 844db85..e086b70 100644
--- a/rewriter/src/rewrite.rs
+++ b/rewriter/src/rewrite.rs
@@ -8,7 +8,6 @@ use oxc_parser::Parser;
 use oxc_span::{SourceType, Span};
 use oxc_syntax::operator::AssignmentOperator;
 use url::Url;
-use urlencoding::encode;
 
 #[derive(Debug)]
 enum JsChange {
@@ -28,16 +27,17 @@ enum JsChange {
     },
 }
 
-#[derive(Debug)]
+type EncodeFn = Box<dyn Fn(String) -> String>;
 struct Rewriter {
     jschanges: Vec<JsChange>,
     base: Url,
+    encode: EncodeFn,
 }
 impl Rewriter {
     fn rewrite_url(&mut self, url: String) -> String {
         let url = self.base.join(&url).unwrap();
 
-        let urlencoded = encode(url.as_str());
+        let urlencoded = (self.encode)(url.to_string());
 
         format!("\"/scramjet/{}\"", urlencoded)
     }
@@ -204,7 +204,7 @@ const UNSAFE_GLOBALS: [&str; 8] = [
     "document",
 ];
 
-pub fn rewrite(js: &str, url: Url) -> Vec<u8> {
+pub fn rewrite(js: &str, url: Url, encode: EncodeFn) -> Vec<u8> {
     let allocator = Allocator::default();
     let source_type = SourceType::default();
     let ret = Parser::new(&allocator, js, source_type).parse();
@@ -222,6 +222,7 @@ pub fn rewrite(js: &str, url: Url) -> Vec<u8> {
     let mut ast_pass = Rewriter {
         jschanges: Vec::new(),
         base: url,
+        encode,
     };
 
     ast_pass.visit_program(&program);
diff --git a/rewriter/test.js b/rewriter/test.js
index 7edd13a..65aeee8 100644
--- a/rewriter/test.js
+++ b/rewriter/test.js
@@ -24,4 +24,6 @@ location += "http://example.com";
 function f() { return import("x") }
 
 
+let window = (1, window);
+