diff --git a/Cargo.lock b/Cargo.lock
index 1404033..43d3eed 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,6 +11,12 @@ dependencies = [
  "gimli",
 ]
 
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
 [[package]]
 name = "ahash"
 version = "0.8.2"
@@ -194,6 +200,7 @@ dependencies = [
  "anyhow",
  "cimvr_engine_interface",
  "log",
+ "miniz_oxide",
  "notify",
  "rand",
  "serde",
@@ -913,6 +920,15 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "miniz_oxide"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7810e0be55b428ada41041c41f32c9f1a42817901b4ccf45fa3d4b6561e74c7"
+dependencies = [
+ "adler",
+]
+
 [[package]]
 name = "mio"
 version = "0.8.5"
diff --git a/client/Cargo.lock b/client/Cargo.lock
index cbed028..ae40ad8 100644
--- a/client/Cargo.lock
+++ b/client/Cargo.lock
@@ -264,6 +264,7 @@ dependencies = [
  "anyhow",
  "cimvr_engine_interface",
  "log",
+ "miniz_oxide 0.7.1",
  "notify",
  "rand",
  "serde",
diff --git a/client/src/main.rs b/client/src/main.rs
index 3a41408..ea68e19 100644
--- a/client/src/main.rs
+++ b/client/src/main.rs
@@ -135,8 +135,9 @@ impl Client {
                 }
                 PluginData::Download(data) => {
                     log::info!("Downloaded {}, saving...", name);
-                    plugin_cache.add_file(&name, &data)?;
-                    bytecode = data;
+                    let decompressed = cimvr_engine::decompress(&data).context("Decompressing wasm")?;
+                    plugin_cache.add_file(&name, &decompressed)?;
+                    bytecode = decompressed;
                 }
             }
 
@@ -188,6 +189,7 @@ impl Client {
                     // Load hotloaded plugins
                     for (name, bytecode) in recv.hotload {
                         log::info!("Reloading {}", name);
+                        let bytecode = cimvr_engine::decompress(&bytecode).context("Decompressing wasm")?;
                         self.engine.reload(name, &bytecode)?;
                     }
 
diff --git a/engine/Cargo.toml b/engine/Cargo.toml
index f57eb84..5e9048b 100644
--- a/engine/Cargo.toml
+++ b/engine/Cargo.toml
@@ -15,3 +15,4 @@ ahash = "0.8.2"
 log = "0.4.17"
 notify = "5.0.0"
 xxhash-rust = { version = "0.8.5", features = ["xxh3"] }
+miniz_oxide = "0.7.1"
diff --git a/engine/src/lib.rs b/engine/src/lib.rs
index 5d42089..75f8a59 100644
--- a/engine/src/lib.rs
+++ b/engine/src/lib.rs
@@ -358,3 +358,13 @@ impl Engine {
 pub fn calculate_digest(data: &[u8]) -> Digest {
     Digest(xxhash_rust::xxh3::xxh3_128(data))
 }
+
+/// Compress some data
+pub fn compress(data: &[u8]) -> Vec<u8> {
+    miniz_oxide::deflate::compress_to_vec(data, 6)
+}
+
+/// Decompress some data
+pub fn decompress(data: &[u8]) -> Result<Vec<u8>> {
+    miniz_oxide::inflate::decompress_to_vec(data).map_err(|e| format_err!("{:#}", e))
+}
diff --git a/server/src/main.rs b/server/src/main.rs
index 7fc8cce..bdaf0ec 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -171,6 +171,7 @@ impl Server {
 
             // Remember which plugins were hotloaded, so that we can send code to
             // the clients!
+            let bytecode = cimvr_engine::compress(&bytecode);
             hotloaded.push((name, bytecode));
         }
 
@@ -190,7 +191,9 @@ impl Server {
                 if req.plugin_manifest.contains(&digest) {
                     response_plugins.push((name.clone(), PluginData::Cached(*digest)));
                 } else {
-                    response_plugins.push((name.clone(), PluginData::Download(code.clone())));
+                    // TODO: Do this only once!
+                    let bytecode = cimvr_engine::compress(&code);
+                    response_plugins.push((name.clone(), PluginData::Download(bytecode)));
                 }
             }