What steps will reproduce the problem?
1.$ gvim -U NONE -u NONE somefile.c (somefile.c should exist and contain some 
lines);
2.use 'j' to move cursor down;
3.If it cannot reproduce, repeat 1-2.

What is the expected output? What do you see instead?
The cursor should move quickly, but the cursor takes seconds to move. So do 
following cursor movements.

What version of the product are you using? On what operating system?

It's on linux.

VIM - Vi IMproved 7.3 (2010 Aug 15, compiled May 20 2011 20:24:03)
Included patches: 1-198
Compiled by xuhong@xuhong-PC
Huge version with GTK2 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() +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_sysmouse 
+mouse_xterm +multi_byte +multi_lang -mzscheme +netbeans_intg +path_extra -perl 
+persistent_undo +postscript +printer +profile +python/dyn +python3/dyn 
+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 
+user_commands +vertsplit +virtualedit +visual +visualextra +viminfo +vreplace 
+wildignore +wildmenu +windows +writebackup +X11 -xfontset +xim +xsmp_interact 
+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: "/usr/local/share/vim"
Compilation: icc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK  -pthread 
-I/usr/include/gtk-2.0 -I/usr/lib64/gtk-2.0/include -I/usr/include/atk-1.0 
-I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/pixman-1 
-I/usr/include/freetype2 -I/usr/include/libpng12     -O3      
Linking: icc   -L/usr/local/lib -Wl,--as-needed -o vim   -pthread -lgtk-x11-2.0 
-lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 
-lgdk_pixbuf-2.0 -lm -lcairo -lpng12 -lpango-1.0 -lfreetype -lfontconfig 
-lgobject-2.0 -lgmodule-2.0 -lgthread-2.0 -lrt -lglib-2.0   -lSM -lICE -lXpm 
-lXt -lX11 -lXdmcp -lSM -lICE -lm -ltinfo -lnsl  -lselinux   -lacl -lattr -lgpm 





I see many deprecated gtk codes in the vim source. Maybe it's caused by them?