--- gutenprint-5.2.4/src/main/print-ps.c.old	2009-12-29 16:34:56.000000000 +0000
+++ gutenprint-5.2.4/src/main/print-ps.c	2009-12-29 16:35:02.000000000 +0000
@@ -1089,7 +1089,6 @@
   int		col;		/* Current column */
   static const char	*hex = "0123456789ABCDEF";
 
-
   col = 0;
   while (length > 0)
   {
@@ -1133,6 +1132,9 @@
   unsigned char	c[5];			/* ASCII85 encoded chars */
   static int	column = 0;		/* Current column */
 
+#define OUTBUF_SIZE 4096
+  unsigned char outbuffer[OUTBUF_SIZE+10];
+  int outp=0;
 
   while (length > 3)
   {
@@ -1144,35 +1146,44 @@
 
     if (b == 0)
     {
-      stp_putc('z', v);
+      outbuffer[outp++]='z';
       column ++;
     }
     else
     {
-      c[4] = (b % 85) + '!';
+      outbuffer[outp+4] = (b % 85) + '!';
       b /= 85;
-      c[3] = (b % 85) + '!';
+      outbuffer[outp+3] = (b % 85) + '!';
       b /= 85;
-      c[2] = (b % 85) + '!';
+      outbuffer[outp+2] = (b % 85) + '!';
       b /= 85;
-      c[1] = (b % 85) + '!';
+      outbuffer[outp+1] = (b % 85) + '!';
       b /= 85;
-      c[0] = b + '!';
+      outbuffer[outp] = b + '!';
 
-      stp_zfwrite((const char *)c, 5, 1, v);
+      outp+=5;
       column += 5;
     }
 
     if (column > 72)
     {
-      stp_putc('\n', v);
+      outbuffer[outp++]='\n';
       column = 0;
     }
 
+    if(outp>=OUTBUF_SIZE)
+	{
+		stp_zfwrite((const char *)outbuffer, outp, 1, v);
+		outp=0;
+	}
+
     data += 4;
     length -= 4;
   }
 
+  if(outp)
+    stp_zfwrite((const char *)outbuffer, outp, 1, v);
+
   if (last_line)
   {
     if (length > 0)