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POWhich default setting does make Vim very slow in Mac's Screen?
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copied!<p><strong>The problem is not solved although I accepted one answer.</strong></p> <p><strong>Problem:</strong> Vim updates very slowly the screen in Screen in Mac, although <a href="http://macvim.org/OSX/index.php#Bugs" rel="nofollow noreferrer">lazyredraw and showcmd are off</a>.</p> <hr> <p>The line numbers get on the foldColumn as below, for instance, when I have line numbers <a href="http://dl.getdropbox.com/u/175564/vimScreenFold.png" rel="nofollow noreferrer">alt text http://dl.getdropbox.com/u/175564/vimScreenFold.png</a></p> <p>When I have nothing in my .vimrc, the problem can be seen by multiplied comment lines on top of one another: <a href="http://dl.getdropbox.com/u/175564/vimScatteredBug.png" rel="nofollow noreferrer">alt text http://dl.getdropbox.com/u/175564/vimScatteredBug.png</a></p> <p>I did not type the following comment more than once on the left-hand side</p> <pre><code>"set list... </code></pre> <p><strong>Observations</strong></p> <ol> <li>seemed to occur only in <a href="https://stackoverflow.com/questions/903816/unable-to-get-vim-work-properly-inside-screen/915980#915980">comment lines and empty lines</a>. However, I got the evidence <a href="https://stackoverflow.com/questions/903816/unable-to-get-vim-work-properly-inside-screen/928182#928182">(2)</a> which shows that this is not the case.</li> <li>scatters occurs mostly in the left-hand-side window. They occur also with a single window. However, it is harder to detect with it.</li> <li>The bug occurs slightly differently when I have nothing in .vimrc. However, the "stagnation" occurs in both situations: with empty .vimrc and with non-empty .vimrc.</li> </ol> <p><strong>Identification of Bug</strong></p> <p><strong>Dependent variables</strong></p> <ol> <li><strong>dependent on <a href="https://stackoverflow.com/questions/903816/unable-to-get-vim-work-properly-inside-screen/929638#929638">comment signs automatically put by Vim</a></strong>. I noticed disappeared pixels when Vim put Python's comment signs # automatically to my files, when it could not show the whole file.</li> <li><strong>dependent on</strong> at least OS/X Leopard.</li> </ol> <p><strong>Independent variables</strong></p> <ol> <li><strong>file independent</strong>: occurs in all files edited by Vim</li> <li><strong><a href="https://stackoverflow.com/questions/903816/unable-to-get-vim-work-properly-inside-screen/929638#929638">line independent</a></strong>: occurs in a Python code without comments and empty lines</li> <li><strong>.vimrc independent</strong>: occurs with empty .vimrc</li> <li><strong>.screenrc independent</strong>: occurs with empty .screenrc</li> <li><strong>shell independent</strong>: occurs with Bash and Zsh</li> <li><strong><a href="https://stackoverflow.com/questions/903816/unable-to-get-vim-work-properly-inside-screen/928182#928182">Screen version independent</a></strong>: occurs with Leopard's default screen and with Screen 4.0.3</li> <li><strong>independent of different comment characters</strong>: occurs when scrolling down, for instance, .zshrc, .vimrc and .screenrc</li> </ol> <p><strong>How can you disable Vim's <a href="https://stackoverflow.com/questions/903816/unable-to-disable-vims-default-setting-which-causes-it-upset-in-screen/929638#929638">default settings</a>?</strong></p>

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