diff --git a/cli/.DS_Store b/cli/.DS_Store
index aed2c26d..ceb4825c 100644
Binary files a/cli/.DS_Store and b/cli/.DS_Store differ
diff --git a/codecs/png/Cargo.toml b/codecs/png/Cargo.toml
index daaaf71d..2114d14b 100644
--- a/codecs/png/Cargo.toml
+++ b/codecs/png/Cargo.toml
@@ -5,6 +5,9 @@ authors = ["Surma <surma@surma.dev>"]
 edition = "2018"
 publish = false
 
+[package.metadata.wasm-pack.profile.release]
+wasm-opt = ["-O", "--no-validation"]
+
 [lib]
 crate-type = ["cdylib"]
 
diff --git a/codecs/png/package.json b/codecs/png/package.json
index adce0fe0..5e22d088 100644
--- a/codecs/png/package.json
+++ b/codecs/png/package.json
@@ -1,6 +1,6 @@
 {
   "name": "oxipng",
   "scripts": {
-    "build": "../build-rust.sh rm -rf pkg && wasm-pack build --debug --target web -- --verbose --locked && rm pkg/.gitignore"
+    "build": "../build-rust.sh rm -rf pkg && wasm-pack build --target web -- --verbose --locked && rm pkg/.gitignore"
   }
 }
diff --git a/codecs/png/pkg/squoosh_png.js b/codecs/png/pkg/squoosh_png.js
index b011728c..651ae14d 100644
--- a/codecs/png/pkg/squoosh_png.js
+++ b/codecs/png/pkg/squoosh_png.js
@@ -113,8 +113,6 @@ const encodeString = (typeof cachedTextEncoder.encodeInto === 'function'
 
 function passStringToWasm0(arg, malloc, realloc) {
 
-    if (typeof(arg) !== 'string') throw new Error('expected a string argument');
-
     if (realloc === undefined) {
         const buf = cachedTextEncoder.encode(arg);
         const ptr = malloc(buf.length);
@@ -143,7 +141,7 @@ function passStringToWasm0(arg, malloc, realloc) {
         ptr = realloc(ptr, len, len = offset + arg.length * 3);
         const view = getUint8Memory0().subarray(ptr + offset, ptr + len);
         const ret = encodeString(arg, view);
-        if (ret.read !== arg.length) throw new Error('failed to pass whole string');
+
         offset += ret.written;
     }
 
@@ -174,10 +172,6 @@ function passArray8ToWasm0(arg, malloc) {
     return ptr;
 }
 
-function _assertNum(n) {
-    if (typeof(n) !== 'number') throw new Error('expected a number argument');
-}
-
 function getArrayU8FromWasm0(ptr, len) {
     return getUint8Memory0().subarray(ptr / 1, ptr / 1 + len);
 }
@@ -193,8 +187,6 @@ export function encode(data, width, height) {
         wasm.__wbindgen_export_2.value = retptr;
         var ptr0 = passArray8ToWasm0(data, wasm.__wbindgen_malloc);
         var len0 = WASM_VECTOR_LEN;
-        _assertNum(width);
-        _assertNum(height);
         wasm.encode(retptr, ptr0, len0, width, height);
         var r0 = getInt32Memory0()[retptr / 4 + 0];
         var r1 = getInt32Memory0()[retptr / 4 + 1];
@@ -234,8 +226,6 @@ function addHeapObject(obj) {
     const idx = heap_next;
     heap_next = heap[idx];
 
-    if (typeof(heap_next) !== 'number') throw new Error('corrupt heap');
-
     heap[idx] = obj;
     return idx;
 }
@@ -251,25 +241,6 @@ function handleError(f) {
     };
 }
 
-function logError(f) {
-    return function () {
-        try {
-            return f.apply(this, arguments);
-
-        } catch (e) {
-            let error = (function () {
-                try {
-                    return e instanceof Error ? `${e.message}\n\nStack:\n${e.stack}` : e.toString();
-                } catch(_) {
-                    return "<failed to stringify thrown value>";
-                }
-            }());
-            console.error("wasm-bindgen: imported JS function that was not marked as `catch` threw an error:", error);
-            throw e;
-        }
-    };
-}
-
 async function load(module, imports) {
     if (typeof Response === 'function' && module instanceof Response) {
 
diff --git a/codecs/png/pkg/squoosh_png_bg.wasm b/codecs/png/pkg/squoosh_png_bg.wasm
index 9de06b41..a0ad39c3 100644
Binary files a/codecs/png/pkg/squoosh_png_bg.wasm and b/codecs/png/pkg/squoosh_png_bg.wasm differ