Hi,
I've been investigating a problem with Unicode listchars.

My .vimrc looks like:

"" show line endings
set list
set listchars=tab:▸\ ,eol:¬

When I open a file containing many tab characters, Macvim is extremely slow to 
scroll - holding down "j" yields a key repeat rate of about once per second.

If I turn off list:

set nolist

Or, use a different tab listchar:

set listchars=tab:+\ ,eol

Scrolling suddenly becomes very fast.

Here is information about my version:

VIM - Vi IMproved 7.3 (2010 Aug 15, compiled Mar  4 2013 10:46:00)
MacOS X (unix) version
Included patches: 1-754
Compiled by [email protected]
Huge version with MacVim GUI.  Features included (+) or not (-):
+arabic +autocmd +balloon_eval +browse ++builtin_terms +byte_offset +cindent 
+clientserver +clipboard +cmdline_compl +cmdline_hist +cmdline_info +comments 
+conceal +cryptv -cscope +cursorbind +cursorshape +dialog_con_gui +diff 
+digraphs +dnd -ebcdic +emacs_tags +eval
+ex_extra +extra_search +farsi +file_in_path +find_in_path +float +folding 
-footer +fork() +fullscreen -gettext -hangul_input +iconv +insert_expand 
+jumplist +keymap +langmap +libcall +linebreak +lispindent +listcmds +localmap 
-lua +menu +mksession +modify_fname +mouse
+mouseshape +mouse_dec -mouse_gpm -mouse_jsbterm +mouse_netterm +mouse_sgr 
-mouse_sysmouse +mouse_urxvt +mouse_xterm +multi_byte +multi_lang -mzscheme 
+netbeans_intg +odbeditor +path_extra +perl +persistent_undo +postscript 
+printer +profile +python -python3 +quickfix
+reltime +rightleft +ruby +scrollbind +signs +smartindent -sniff +startuptime 
+statusline -sun_workshop +syntax +tag_binary +tag_old_static -tag_any_white 
+tcl +terminfo +termresponse +textobjects +title +toolbar +transparency 
+user_commands +vertsplit +virtualedit
+visual +visualextra +viminfo +vreplace +wildignore +wildmenu +windows 
+writebackup -X11 -xfontset +xim -xsmp -xterm_clipboard -xterm_save
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
      user exrc file: "$HOME/.exrc"
  system gvimrc file: "$VIM/gvimrc"
    user gvimrc file: "$HOME/.gvimrc"
    system menu file: "$VIMRUNTIME/menu.vim"
  fall-back for $VIM: "/Applications/MacVim.app/Contents/Resources/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_MACVIM -Wall 
-Wno-unknown-pragmas -pipe  -DMACOS_X_UNIX -no-cpp-precomp  -g -O2 
-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1     
-I/System/Library/Frameworks/Tcl.framework/Headers  -D_REENTRANT=1  
-D_THREAD_SAFE=1  -D
_DARWIN_C_SOURCE=1
Linking: clang   -L.   -L.        -L/usr/local/lib -o Vim -framework Cocoa 
-framework Carbon      -lncurses -liconv -framework Cocoa    -fstack-protector 
-L/usr/local/lib  -L/System/Library/Perl/5.12/darwin-thread-multi-2level/CORE 
-lperl -lm -lutil -lc -framework Python
  -F/System/Library/Frameworks -framework Tcl -framework CoreFoundation 
-framework Ruby

I am running on Mountain Lion. Let me know if I can do anything to help debug 
this issue further.

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