Using some of the ideas presented by rformato, I've significantly sped up $("#id...

diff --git a/src/jquery/jquery.js b/src/jquery/jquery.js
index 9eb8377..dfe55bc 100644 (file)
--- a/src/jquery/jquery.js
+++ b/src/jquery/jquery.js
@@ -34,6 +34,8 @@ if ( typeof $ != "undefined" )
 // Map the jQuery namespace to the '$' one
 window.$ = jQuery;
 
+var quickExpr = /^[^<]*(<(.|\s)+>)[^>]*$|^#(\w+)$/;
+
 /**
  * This function accepts a string containing a CSS or
  * basic XPath selector which is then used to match a set of elements.
@@ -150,22 +152,39 @@ jQuery.fn = jQuery.prototype = {
                // Make sure that a selection was provided
                a = a || document;
 
-               // HANDLE: $(function)
-               // Shortcut for document ready
-               if ( jQuery.isFunction(a) )
-                       return new jQuery(document)[ jQuery.fn.ready ? "ready" : "load" ]( a );
-
                // Handle HTML strings
                if ( typeof a  == "string" ) {
-                       // HANDLE: $(html) -> $(array)
-                       var m = /^[^<]*(<(.|\s)+>)[^>]*$/.exec(a);
-                       if ( m )
-                               a = jQuery.clean( [ m[1] ] );
+                       var m = quickExpr.exec(a);
+                       if ( m && (m[1] || !c) ) {
+                               // HANDLE: $(html) -> $(array)
+                               if ( m[1] )
+                                       a = jQuery.clean( [ m[1] ] );
+
+                               // HANDLE: $("#id")
+                               else {
+                                       var tmp = document.getElementById( m[3] );
+                                       if ( tmp )
+                                               // Handle the case where IE and Opera return items
+                                               // by name instead of ID
+                                               if ( tmp.id != m[3] )
+                                                       return jQuery().find( a );
+                                               else {
+                                                       this[0] = tmp;
+                                                       this.length = 1;
+                                                       return this;
+                                               }
+                                       else
+                                               a = [];
+                               }
 
                        // HANDLE: $(expr)
-                       else
+                       } else
                                return new jQuery( c ).find( a );
-               }
+
+               // HANDLE: $(function)
+               // Shortcut for document ready
+               } else if ( jQuery.isFunction(a) )
+                       return new jQuery(document)[ jQuery.fn.ready ? "ready" : "load" ]( a );
 
                return this.setArray(
                        // HANDLE: $(array)