Vim response quite slow

Question

If I open a file containing 5,000 lines of code and continue to input, I found that my vim became very slow, it displays my input after about 1s.

It even won\'t become

Answer 1

If running vim 7.4,

put this in your .vimrc

set regexpengine=1

vim 7.4 has a new regex engine that appear not to work well in some situations. Previous version vim 7.3 used the old engine ( set regexpengine=1 ).

The "slow response" from syntax highlighting problem affects the vim help files as well ( and .vimrc file too ).