diff --git a/Plugins/SwordBuildToolPlugin/SwordBuildToolPlugin.swift b/Plugins/SwordBuildToolPlugin/SwordBuildToolPlugin.swift
index b21b96e..7c9898a 100644
--- a/Plugins/SwordBuildToolPlugin/SwordBuildToolPlugin.swift
+++ b/Plugins/SwordBuildToolPlugin/SwordBuildToolPlugin.swift
@@ -9,8 +9,11 @@ struct SwordBuildToolPlugin: BuildToolPlugin {
     let targets = transitiveTargets(for: sourceModule)
     let targetByName = Dictionary(targets.map { ($0.name, $0) }, uniquingKeysWith: { (first, _) in first })
     let targetSourceModules = targetByName.values.compactMap(\.sourceModule)
-    let inputPaths = ([sourceModule] + targetSourceModules).flatMap { sourceModule in
-      sourceModule.sourceFiles(withSuffix: "swift").map(\.path)
+    let inputDirectories = ([sourceModule] + targetSourceModules).compactMap { sourceModule in
+      relativePath(
+        from: context.package.directoryURL,
+        to: URL(fileURLWithPath: sourceModule.directory.string, isDirectory: true).standardized
+      )
     }
     let output = context.pluginWorkDirectory.appending("Sword.generated.swift")
     var arguments = [String]()
@@ -18,8 +21,8 @@ struct SwordBuildToolPlugin: BuildToolPlugin {
     if !targetNames.isEmpty {
       arguments += ["--targets"] + targetNames
     }
-    if !inputPaths.isEmpty {
-      arguments += ["--inputs"] + inputPaths.map(\.string)
+    if !inputDirectories.isEmpty {
+      arguments += ["--inputs"] + inputDirectories
     }
     arguments += ["--output", output.string]
     return [
@@ -46,6 +49,17 @@ struct SwordBuildToolPlugin: BuildToolPlugin {
       }
     }
   }
+
+  private func relativePath(from baseURL: URL, to absoluteURL: URL) -> String? {
+    guard absoluteURL.path.hasPrefix(baseURL.path) else { return nil }
+
+    var relative = absoluteURL.path.replacingOccurrences(of: baseURL.path, with: "")
+    if relative.hasPrefix("/") {
+      relative.removeFirst()
+    }
+
+    return relative
+  }
 }
 
 #if canImport(XcodeProjectPlugin)
diff --git a/Sources/SwordCommand/SwordCommand.swift b/Sources/SwordCommand/SwordCommand.swift
index 1e932a5..eb283c6 100644
--- a/Sources/SwordCommand/SwordCommand.swift
+++ b/Sources/SwordCommand/SwordCommand.swift
@@ -76,12 +76,11 @@ struct SwordCommand: ParsableCommand {
     }
 
     let fileManager = FileManager.default
-    let currentDirectoryPath = URL(filePath: fileManager.currentDirectoryPath)
-    let absolutePath = currentDirectoryPath.appending(path: path)
+    let absolutePath = URL(filePath: fileManager.currentDirectoryPath).appending(path: path)
     return fileManager.subpaths(atPath: absolutePath.path())?.compactMap { element -> URL? in
       guard element.hasSuffix(".swift") else { return nil }
 
-      let elementAbsolutePath = currentDirectoryPath.appending(path: element)
+      let elementAbsolutePath = absolutePath.appending(path: element)
       return elementAbsolutePath.path().isFile ? elementAbsolutePath : nil
     } ?? []
   }
diff --git a/Sources/SwordGenerator/Logging/Logging.swift b/Sources/SwordGenerator/Logging/Logging.swift
new file mode 100644
index 0000000..3fc3312
--- /dev/null
+++ b/Sources/SwordGenerator/Logging/Logging.swift
@@ -0,0 +1,14 @@
+import os
+
+enum Logging {
+  static let logger = Logger(subsystem: "com.rockname.sword", category: "Generator")
+  static let signposter = OSSignposter(logger: logger)
+
+  static func recordInterval<R>(name: StaticString, body: () throws -> R) rethrows -> R {
+    let signpostID = signposter.makeSignpostID()
+    let state = signposter.beginInterval(name, id: signpostID)
+    let result = try body()
+    signposter.endInterval(name, state)
+    return result
+  }
+}
diff --git a/Sources/SwordGenerator/Parser/SwordParser.swift b/Sources/SwordGenerator/Parser/SwordParser.swift
index 6d562b7..e94e839 100644
--- a/Sources/SwordGenerator/Parser/SwordParser.swift
+++ b/Sources/SwordGenerator/Parser/SwordParser.swift
@@ -19,43 +19,51 @@ package struct SwordParser {
     let moduleRegistry = ModuleRegistry()
     let importRegistry = ImportRegistry()
 
-    for sourceFile in sourceFiles {
-      let visitors: [SyntaxVisitor] = [
-        ComponentVisitor(
-          componentRegistry: componentRegistry,
-          sourceFile: sourceFile
-        ),
-        SubcomponentVisitor(
-          componentRegistry: componentRegistry,
-          sourceFile: sourceFile
-        ),
-        DependencyVisitor(
-          dependencyRegistry: dependencyRegistry,
-          sourceFile: sourceFile
-        ),
-        ModuleVisitor(
-          moduleRegistry: moduleRegistry,
-          sourceFile: sourceFile
-        ),
-        ImportVisitor(
-          importRegistry: importRegistry,
-          sourceFile: sourceFile
-        ),
-      ]
-      for visitor in visitors {
-        visitor.walk(sourceFile.tree)
+    Logging.recordInterval(name: "parseSourceFiles") {
+      for sourceFile in sourceFiles {
+        let visitors: [SyntaxVisitor] = [
+          ComponentVisitor(
+            componentRegistry: componentRegistry,
+            sourceFile: sourceFile
+          ),
+          SubcomponentVisitor(
+            componentRegistry: componentRegistry,
+            sourceFile: sourceFile
+          ),
+          DependencyVisitor(
+            dependencyRegistry: dependencyRegistry,
+            sourceFile: sourceFile
+          ),
+          ModuleVisitor(
+            moduleRegistry: moduleRegistry,
+            sourceFile: sourceFile
+          ),
+          ImportVisitor(
+            importRegistry: importRegistry,
+            sourceFile: sourceFile
+          ),
+        ]
+        for visitor in visitors {
+          visitor.walk(sourceFile.tree)
+        }
       }
-    }
 
-    for target in targets {
-      importRegistry.register(target)
+      for target in targets {
+        importRegistry.register(target)
+      }
     }
 
-    let componentValidationResult = ComponentValidator(componentRegistry: componentRegistry)
-      .validate()
-    let dependencyValidationResult = DependencyValidator(dependencyRegistry: dependencyRegistry)
-      .validate()
-    let moduleValidationResult = ModuleValidator(moduleRegistry: moduleRegistry).validate()
+    let componentValidationResult = Logging.recordInterval(name: "makeComponentTree") {
+      ComponentValidator(componentRegistry: componentRegistry)
+        .validate()
+    }
+    let dependencyValidationResult = Logging.recordInterval(name: "makeDependencies") {
+      DependencyValidator(dependencyRegistry: dependencyRegistry)
+        .validate()
+    }
+    let moduleValidationResult = Logging.recordInterval(name: "makeModules") {
+      ModuleValidator(moduleRegistry: moduleRegistry).validate()
+    }
     guard
       case .valid((let component, let subcomponentsByParent)) = componentValidationResult,
       case .valid(let dependenciesByComponentName) = dependencyValidationResult,
@@ -72,19 +80,23 @@ package struct SwordParser {
       exit(1)
     }
 
-    let bindingGraphFactory = BindingGraphFactory(
-      subcomponentsByParent: subcomponentsByParent,
-      dependenciesByComponentName: dependenciesByComponentName,
-      modulesByComponentName: modulesByComponentName
-    )
-    let bindingGraph = bindingGraphFactory.makeBindingGraph(rootComponent: component)
-    let bindingGraphValidationResult = BindingGraphValidator(bindingGraph: bindingGraph).validate()
-
-    guard case .valid = bindingGraphValidationResult else {
-      for report in bindingGraphValidationResult.reports {
-        reporter.send(report)
+    let bindingGraph = Logging.recordInterval(name: "makeBindingGraph") {
+      let bindingGraphFactory = BindingGraphFactory(
+        subcomponentsByParent: subcomponentsByParent,
+        dependenciesByComponentName: dependenciesByComponentName,
+        modulesByComponentName: modulesByComponentName
+      )
+      let bindingGraph = bindingGraphFactory.makeBindingGraph(rootComponent: component)
+      let bindingGraphValidationResult = BindingGraphValidator(bindingGraph: bindingGraph)
+        .validate()
+      guard case .valid = bindingGraphValidationResult else {
+        for report in bindingGraphValidationResult.reports {
+          reporter.send(report)
+        }
+        exit(1)
       }
-      exit(1)
+
+      return bindingGraph
     }
 
     return (
diff --git a/Sources/SwordGenerator/SwordGenerator.swift b/Sources/SwordGenerator/SwordGenerator.swift
index a2792f4..9b010be 100644
--- a/Sources/SwordGenerator/SwordGenerator.swift
+++ b/Sources/SwordGenerator/SwordGenerator.swift
@@ -18,10 +18,12 @@ package struct SwordGenerator {
     output: String
   ) throws {
     let (bindingGraph, imports) = try parser.parse(sourceFiles: sourceFiles, targets: targets)
-    try exporter.export(
-      bindingGraph: bindingGraph,
-      imports: imports,
-      outputPath: URL(filePath: output)
-    )
+    try Logging.recordInterval(name: "exportBindingGraph") {
+      try exporter.export(
+        bindingGraph: bindingGraph,
+        imports: imports,
+        outputPath: URL(filePath: output)
+      )
+    }
   }
 }