vimrc: add cursorline-related optimizations

.vim/vimrc

@@ -476,6 +476,7 @@ set backspace=2
 
 set splitbelow splitright     " splits open at bottom and right
 set lazyredraw                " don't redraw while executing macros (good performance config)
+set ttyfast
 
 set listchars=trail:•,tab:>-
 set list                      " show/hide tabs and EOL chars (hidden characters)
@@ -531,3 +532,7 @@ set gfn=Fira\ Code\ weight=450\ 12
 
 set ballooneval               " vim8+ popups
 let g:netrw_beval = 1
+
+" cursorline optimizations
+set cursorlineopt=number
+syntax sync minlines=256