diff --git a/Cargo.toml b/Cargo.toml
index f60446d3..cca6184d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -47,8 +47,8 @@ version = "^2.10.0"
 optional = true
 version = "1.0.1"
 
-[dependencies.cloudflare-zlib-sys]
-version = "^0.1.2"
+[target.'cfg(any(target_arch = "x86_64", target_arch = "aarch64"))'.dependencies]
+cloudflare-zlib-sys = "^0.1.2"
 
 [dependencies.image]
 default-features = false
diff --git a/src/deflate/mod.rs b/src/deflate/mod.rs
index 273cb66c..71c6bc65 100644
--- a/src/deflate/mod.rs
+++ b/src/deflate/mod.rs
@@ -15,6 +15,7 @@ pub fn inflate(data: &[u8]) -> PngResult<Vec<u8>> {
 }
 
 /// Compress a data stream using the DEFLATE algorithm
+#[cfg(any(target_arch = "x86_64", target_arch = "aarch64"))]
 pub fn deflate(data: &[u8], zc: u8, zs: u8, zw: u8, max_size: &AtomicMin) -> PngResult<Vec<u8>> {
     if is_cfzlib_supported() {
         return cfzlib_deflate(data, zc, zs, zw, max_size);
@@ -23,22 +24,29 @@ pub fn deflate(data: &[u8], zc: u8, zs: u8, zw: u8, max_size: &AtomicMin) -> Png
     miniz_stream::compress_to_vec_oxipng(data, zc, zw.into(), zs.into(), max_size)
 }
 
+/// Compress a data stream using the DEFLATE algorithm
+#[cfg(not(any(target_arch = "x86_64", target_arch = "aarch64")))]
+pub fn deflate(data: &[u8], zc: u8, zs: u8, zw: u8, max_size: &AtomicMin) -> PngResult<Vec<u8>> {
+    miniz_stream::compress_to_vec_oxipng(data, zc, zw.into(), zs.into(), max_size)
+}
+
+#[cfg(target_arch = "x86_64")]
 fn is_cfzlib_supported() -> bool {
-    #[cfg(target_arch = "x86_64")]
-    {
-        if is_x86_feature_detected!("sse4.2") && is_x86_feature_detected!("pclmulqdq") {
-            return true;
-        }
-    }
-    #[cfg(target_arch = "aarch64")]
-    {
-        if is_arm_feature_detected!("neon") && is_arm_feature_detected!("crc") {
-            return true;
-        }
+    if is_x86_feature_detected!("sse4.2") && is_x86_feature_detected!("pclmulqdq") {
+        return true;
     }
     false
 }
 
+#[cfg(target_arch = "aarch64")]
+fn is_cfzlib_supported() -> bool {
+    if is_arm_feature_detected!("neon") && is_arm_feature_detected!("crc") {
+        return true;
+    }
+    false
+}
+
+#[cfg(any(target_arch = "x86_64", target_arch = "aarch64"))]
 pub fn cfzlib_deflate(
     data: &[u8],
     level: u8,
diff --git a/src/lib.rs b/src/lib.rs
index b1cd918e..4d8240da 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,6 @@
 extern crate bit_vec;
 extern crate byteorder;
+#[cfg(any(target_arch = "x86_64", target_arch = "aarch64"))]
 extern crate cloudflare_zlib_sys;
 extern crate crc;
 extern crate image;
@@ -687,8 +688,15 @@ fn optimize_png(png: &mut PngData, original_data: &[u8], opts: &Options) -> PngR
         }
     }
 
-    let old_png = image::load_from_memory_with_format(original_data, ImageFormat::PNG);
-    let new_png = image::load_from_memory_with_format(&output, ImageFormat::PNG);
+    let (old_png, new_png) = {
+        let old_png = || image::load_from_memory_with_format(original_data, ImageFormat::PNG);
+        let new_png = || image::load_from_memory_with_format(&output, ImageFormat::PNG);
+        #[cfg(feature = "parallel")]
+        let res = rayon::join(old_png, new_png);
+        #[cfg(not(feature = "parallel"))]
+        let res = (old_png(), new_png());
+        res
+    };
 
     if let Ok(new_png) = new_png {
         if let Ok(old_png) = old_png {
@@ -893,11 +901,15 @@ fn copy_permissions(input_path: &Path, out_file: &File, verbosity: Option<u8>) {
 fn images_equal(old_png: &DynamicImage, new_png: &DynamicImage) -> bool {
     let a = old_png
         .pixels()
-        .map(|x| x.2.channels().to_owned())
-        .filter(|p| !(p.len() == 4 && p[3] == 0));
+        .filter(|x| {
+            let p = x.2.channels();
+            !(p.len() == 4 && p[3] == 0)
+        });
     let b = new_png
         .pixels()
-        .map(|x| x.2.channels().to_owned())
-        .filter(|p| !(p.len() == 4 && p[3] == 0));
+        .filter(|x| {
+            let p = x.2.channels();
+            !(p.len() == 4 && p[3] == 0)
+        });
     a.eq(b)
 }