A few suggests

[ruichao-factual]

1. set a longer timeoutlen. 0.5 second is a little short

set tm=1000

2.set t_ti= t_te= is annoying . Vim has permanent undo history.

1. If you want to map ctrl + space to ?

use map <c-@> ?

1. duplicate

set showcmd

1. pastetoggle comment mistake, should be

[wklken]

thx for the suggestions

set t_ti= t_te=

set this is because I always need to copy something when I exit vim in command line.
U can remove it.

ctrl + space

use map <c-@> ?

When use Mac, that will call spotlight.......

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[wklken]

fixed!
thx!