title: Speed up VIM cursor moving through j/k
body: <p>On my friend new Mac, he scrolls from line #1 to line #100 using <code>k</code> in around 4 seconds.
  On my Mac, it takes 10 seconds. Neither of us know what causes his MacVim scrolls that fast.</p>
  
  <p>Any way that I can improve the speed of scrolling on my MacVim? I already enabled <code>ttyfast</code> and <code>lazyredraw</code></p>