diff --git a/VERSION b/VERSION
index be769205..3411c173 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-8.3.409
+8.3.410
diff --git a/doc/html/lef.html b/doc/html/lef.html
index c387cf64..c632dc23 100644
--- a/doc/html/lef.html
+++ b/doc/html/lef.html
@@ -76,6 +76,18 @@ LEF-format input and output
 		itself would be written to a DEF file. <BR>
 		Options <B>-hide</B>, <B>-tech</B>, and <B>-toplayer</B> are
 		the same as for the <B>lef write</B> command.
+	   <DT> <B>nocheck</B> [<I>netname</I> ...]|[<B>none</B>]
+	   <DD> Do not check for antenna diffusion and gate area on the nets with
+		the names given as option <I>netname</I>.
+		Any number of net names may be given as arguments.  Typically,
+		power and ground nets should not need these checks.  If the nets
+		are attached to port labels that have been flagged with the use
+		"<B>power</B>" or "<B>ground</B>", then these nets will be
+		skipped automatically.  If not, then this command option provides
+		an alternative way to avoid running the checks, which can cause
+		a huge performance hit when generating a LEF view of a large
+		layout.  With the single argument "<B>none</B>", removes the
+		list of net names for which antenna checks should be skipped.
 	   <DT> <B>datestamp</B> [<I>value</I>|<B>default</B>]
 	   <DD> Force all cell definitions generated from LEF macros to have
 		the datestamp (timestamp) of <I>value</I>.  This can be used to
diff --git a/lef/lefWrite.c b/lef/lefWrite.c
index 7dcc6388..aed92f05 100644
--- a/lef/lefWrite.c
+++ b/lef/lefWrite.c
@@ -1442,12 +1442,22 @@ lefWriteMacro(def, f, scale, setback, pinonly, toplayer, domaster)
 	    scx.scx_area = labr;
 	    SelectClear();
 
-	    // Check for net names to ignore for antenna checks.
 	    ignored = FALSE;
-	    for (lnn = lefIgnoreNets; lnn; lnn = lnn->lnn_next)
-		if (!strcmp(lnn->lnn_name, lab->lab_text))
+
+	    // Ports that have been flagged as power or ground should not be
+	    // checked for antenna diffusion and gate area.
+
+	    if ((lab->lab_flags & PORT_DIR_MASK) != 0)
+		if (((lab->lab_flags & PORT_USE_MASK) == PORT_USE_POWER) ||
+			((lab->lab_flags & PORT_USE_MASK) == PORT_USE_GROUND))
 		    ignored = TRUE;
 
+	    // Check for net names to ignore for antenna checks.
+	    if (!ignored)
+		for (lnn = lefIgnoreNets; lnn; lnn = lnn->lnn_next)
+		    if (!strcmp(lnn->lnn_name, lab->lab_text))
+			ignored = TRUE;
+
 	    if (!ignored || (setback != 0))
 		SelectNet(&scx, lab->lab_type, 0, NULL, FALSE);