diff --git a/7.3.455 b/7.3.455
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+To: vim_dev@googlegroups.com
+Subject: Patch 7.3.455
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.3.455
+Problem:    Using many continuation lines can be slow.
+Solution:   Adjust the reallocation size to the current length.
+Files:	    src/ex_cmds2.c
+
+
+*** ../vim-7.3.454/src/ex_cmds2.c	2012-02-11 20:40:49.000000000 +0100
+--- src/ex_cmds2.c	2012-02-22 18:24:11.000000000 +0100
+***************
+*** 3448,3454 ****
+  	{
+  	    garray_T    ga;
+  
+! 	    ga_init2(&ga, (int)sizeof(char_u), 200);
+  	    ga_concat(&ga, line);
+  	    ga_concat(&ga, p + 1);
+  	    for (;;)
+--- 3448,3454 ----
+  	{
+  	    garray_T    ga;
+  
+! 	    ga_init2(&ga, (int)sizeof(char_u), 400);
+  	    ga_concat(&ga, line);
+  	    ga_concat(&ga, p + 1);
+  	    for (;;)
+***************
+*** 3460,3465 ****
+--- 3460,3474 ----
+  		p = skipwhite(sp->nextline);
+  		if (*p != '\\')
+  		    break;
++ 		/* Adjust the growsize to the current length to speed up
++ 		 * concatenating many lines. */
++ 		if (ga.ga_len > 400)
++ 		{
++ 		    if (ga.ga_len > 8000)
++ 			ga.ga_growsize = 8000;
++ 		    else
++ 			ga.ga_growsize = ga.ga_len;
++ 		}
+  		ga_concat(&ga, p + 1);
+  	    }
+  	    ga_append(&ga, NUL);
+*** ../vim-7.3.454/src/version.c	2012-02-22 18:12:29.000000000 +0100
+--- src/version.c	2012-02-22 18:24:58.000000000 +0100
+***************
+*** 716,717 ****
+--- 716,719 ----
+  {   /* Add new patch number below this line */
++ /**/
++     455,
+  /**/
+
+-- 
+From "know your smileys":
+ :-X	My lips are sealed
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
+///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\  an exciting new programming language -- http://www.Zimbu.org        ///
+ \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///