Don't cache path Context based on cwd, as cwd involves a system-call to compute.

pkg/path/lib/src/context.dart

Index: pkg/path/lib/src/context.dart
diff --git a/pkg/path/lib/src/context.dart b/pkg/path/lib/src/context.dart
index 823e0c28402d83b6b7db1e0f305174be5ac303f7..eecb1df96111013eabac749ac51ac303e8f01e9a 100644
--- a/pkg/path/lib/src/context.dart
+++ b/pkg/path/lib/src/context.dart
@@ -41,13 +41,20 @@ class Context {
     return new Context._(style, current);
   }
 
-  Context._(this.style, this.current);
+  /// Create a [Context] to be used internally within path.
+  Context.internal() : style = Style.platform;

[Bob Nystrom, 2014/08/01 16:32:07]

Since _current is final, don't you need to initialize it to null here?

[Anders Johnsen, 2014/08/04 06:33:14]

It's auto-initialized to null.

[Anders Johnsen, 2014/08/04 06:58:07]

Ha, nice one Anders... You are of cause right - fixed in followup :)

+
+  Context._(this.style, this._current);
 
   /// The style of path that this context works with.
   final InternalStyle style;
 
-  /// The current directory that relative paths will be relative to.
-  final String current;
+  /// The current directory given when Context was created. If null, current
+  /// directory is evaluated from 'p.current'.
+  final String _current;
+
+  /// The current directory that relative paths are relative to.
+  String get current => _current != null ? _current : p.current;
 
   /// Gets the path separator for the context's [style]. On Mac and Linux,
   /// this is `/`. On Windows, it's `\`.