diff --git a/sdk-builder/src/main.rs b/sdk-builder/src/main.rs
index 6a8458e..b21bba7 100644
--- a/sdk-builder/src/main.rs
+++ b/sdk-builder/src/main.rs
@@ -249,6 +249,7 @@ pub mod rust {
     use itertools::Itertools;
     use proc_macro2::{Ident, TokenStream};
     use quote::{format_ident, quote};
+    use rayon::prelude::{IntoParallelIterator, ParallelIterator};
     use unreal_sdk::sdk::repr::{
         Class, ClassField, ClassMethod, Enum, ObjectRef, PackageRef, PrimitiveType,
         ProcessedPackage, Sdk, StructKind, Type, UnrealType,
@@ -365,7 +366,7 @@ pub mod rust {
             }
         }
 
-        pub fn build(self, args: &super::Build) -> anyhow::Result<BTreeMap<String, TokenStream>> {
+        pub fn build(self, args: &super::Build) -> anyhow::Result<BTreeMap<String, String>> {
             let pkgs = if let Some(packages) = &args.packages {
                 let deps = self.dependencies_for_package_names(packages);
                 log::debug!("all dependencies: {deps:?}");
@@ -378,18 +379,73 @@ pub mod rust {
             };
 
             let packages = pkgs
-                .into_iter()
+                .into_par_iter()
                 .map(|pkg| {
-                    let name = canonicalize_name(&pkg.name).to_string();
-                    let tokens = self.generate_package(pkg, args.feature_gate)?;
+                    let (ident, tokens) = self.generate_package(pkg, args.feature_gate)?;
 
-                    anyhow::Ok((name, tokens))
+                    let tokens = if args.single_file {
+                        tokens
+                    } else {
+                        quote! {
+                            pub mod #ident {
+                                #tokens
+                            }
+                        }
+                    };
+
+                    anyhow::Ok((ident.to_string(), tokens.to_string()))
                 })
                 .collect::<Result<BTreeMap<_, _>, _>>()?;
 
             Ok(packages)
         }
 
+        pub fn build_in_dir<P: AsRef<Path>>(
+            self,
+            path: P,
+            args: &super::Build,
+        ) -> anyhow::Result<()> {
+            let packages = self.build(args)?;
+
+            let path = path.as_ref();
+            std::fs::create_dir_all(&path)?;
+
+            let mut mod_rs = TokenStream::new();
+
+            for (name, tokens) in packages {
+                let name = format_ident!("{name}");
+                if args.single_file {
+                    mod_rs.extend(quote! {
+                        pub mod #name {
+                            #tokens
+                        }
+                    });
+                } else {
+                    let path = path.join(format!("{name}.rs"));
+
+                    log::info!("parsing {name}..");
+                    let file =
+                        syn::parse_file(&tokens).context("syn failed to parse generated code")?;
+
+                    log::info!("pretty printing {name}..");
+                    let contents = prettyplease::unparse(&file);
+                    log::info!("writing to {}..", path.display());
+                    std::fs::write(path, contents)?;
+
+                    mod_rs.extend(quote! {
+                        pub mod #name;
+                    });
+                }
+            }
+
+            let contents = prettyplease::unparse(
+                &syn::parse_file(&mod_rs.to_string()).context("syn failed to parse root module")?,
+            );
+            std::fs::write(path.join("mod.rs"), contents)?;
+
+            Ok(())
+        }
+
         fn get_package_by_name(&self, name: &str) -> Option<PackageRef> {
             self.sdk
                 .packages
@@ -427,52 +483,6 @@ pub mod rust {
             }
         }
 
-        pub fn build_in_dir<P: AsRef<Path>>(
-            self,
-            path: P,
-            args: &super::Build,
-        ) -> anyhow::Result<()> {
-            let packages = self.build(args)?;
-
-            let path = path.as_ref();
-            std::fs::create_dir_all(&path)?;
-
-            let mut mod_rs = TokenStream::new();
-
-            for (name, tokens) in packages {
-                let name = format_ident!("{name}");
-                if args.single_file {
-                    mod_rs.extend(quote! {
-                        pub mod #name {
-                            #tokens
-                        }
-                    });
-                } else {
-                    let path = path.join(format!("{name}.rs"));
-
-                    log::info!("parsing {name}..");
-                    let file = syn::parse_file(&tokens.to_string())
-                        .context("syn failed to parse generated code")?;
-
-                    log::info!("pretty printing {name}..");
-                    let contents = prettyplease::unparse(&file);
-                    log::info!("writing to {}..", path.display());
-                    std::fs::write(path, contents)?;
-
-                    mod_rs.extend(quote! {
-                        pub mod #name;
-                    });
-                }
-            }
-
-            let contents = prettyplease::unparse(
-                &syn::parse_file(&mod_rs.to_string()).context("syn failed to parse root module")?,
-            );
-            std::fs::write(path.join("mod.rs"), contents)?;
-
-            Ok(())
-        }
-
         fn generate_enum(&self, enum0: &Enum) -> anyhow::Result<TokenStream> {
             let name = self
                 .get_type_ident(&enum0.obj_ref)
@@ -971,7 +981,7 @@ pub mod rust {
             &self,
             pkg: &ProcessedPackage,
             feature_gate: bool,
-        ) -> anyhow::Result<TokenStream> {
+        ) -> anyhow::Result<(Ident, TokenStream)> {
             let pkg_name = canonicalize_ident(&pkg.name);
             log::info!(
                 "generating package \"{pkg_name}\" with {} types..",
@@ -1009,14 +1019,15 @@ pub mod rust {
                 None
             };
 
-            Ok(quote! {
-                pub mod #pkg_name {
+            Ok((
+                pkg_name,
+                quote! {
                     #feature_gate
                     #![allow(dead_code, unused_imports, non_snake_case, non_camel_case_types)]
 
                     #pkg_tokens
-                }
-            })
+                },
+            ))
         }
     }
 }