Simple .vimrc takes a very long time to save

Question

Saving a file with :w takes several seconds for me, and I can't figure out the culprit. This is my .vimrc

" Specify a directory for plugins
" - For Neovim: ~/.local/share/nvim/plugged
" - Avoid using standard Vim directory names like 'plugin'
call plug#begin('~/.vim/plugged')

  Plug 'fatih/vim-go', { 'do': ':GoInstallBinaries' }
  Plug 'lifepillar/vim-solarized8'

" Initialize plugin system
call plug#end()

""""""""""""""""""""""
"      Settings      "
""""""""""""""""""""""
set nocompatible                " Enables us Vim specific features
filetype off                    " Reset filetype detection first ...
filetype plugin indent on       " ... and enable filetype detection
set ttyfast                     " Indicate fast terminal conn for faster redraw
set ttymouse=xterm2             " Indicate terminal type for mouse codes
set ttyscroll=3                 " Speedup scrolling
set laststatus=2                " Show status line always
set encoding=utf-8              " Set default encoding to UTF-8
set autoread                    " Automatically read changed files
set autoindent                  " Enabile Autoindent
set backspace=indent,eol,start  " Makes backspace key more powerful.
set incsearch                   " Shows the match while typing
set hlsearch                    " Highlight found searches

set noerrorbells                " No beeps
set number                      " Show line numbers
set showcmd                     " Show me what I'm typing
set noswapfile                  " Don't use swapfile
set nobackup                    " Don't create annoying backup files
set splitright                  " Vertical windows should be split to right
set splitbelow                  " Horizontal windows should split to bottom
set autowrite                   " Automatically save before :next, :make etc.
                " Don't need to write before calling :GoBuild!
set hidden                      " Buffer should still exist if window is closed
set fileformats=unix,dos,mac    " Prefer Unix over Windows over OS 9 formats
set noshowmatch                 " Do not show matching brackets by flickering
set noshowmode                  " We show the mode with airline or lightline
set ignorecase                  " Search case insensitive...
set smartcase                   " ... but not it begins with upper case
set completeopt=menu,menuone    " Show popup menu, even if there is one entry
set pumheight=10                " Completion window max size
set nocursorcolumn              " Do not highlight column (speeds up highlighting)
set nocursorline                " Do not highlight cursor (speeds up highlighting)
set lazyredraw                  " Wait to redraw

set belloff=all

" Strips trailing whitespace
autocmd BufWritePre * %s/\s\+$//e

" Clears search buffer with ,/
nmap <silent> ,/ :nohlsearch<CR>
" Turn off search highlight
nnoremap <leader><space> :nohlsearch<CR>

" Enable to copy to clipboard for operations like yank, delete, change and put
" http://stackoverflow.com/questions/20186975/vim-mac-how-to-copy-to-clipboard-without-pbcopy
if has('unnamedplus')
  set clipboard^=unnamed
  set clipboard^=unnamedplus
else
  set clipboard=unnamed
endif

" Colorscheme
let g:solarized_use16 = 1
set background=light
colorscheme solarized8

""""""""""""""""""""""
"      Mappings      "
""""""""""""""""""""""

" Set leader shortcut to a comma ','. By default it's the backslash
let mapleader = " "

" Search mappings: These will make it so that going to the next one in a
" search will center on the line it's found in.
nnoremap n nzzzv
nnoremap N Nzzzv

" Act like D and C
nnoremap Y y$

" Settings: Mouse & Scrolling
set mouse=a
nnoremap <2-LeftMouse> <nop>
inoremap <2-LeftMouse> <nop>
vnoremap <2-LeftMouse> <nop>
nnoremap <ScrollWheelUp> <C-y>
nnoremap <ScrollWheelDown> <C-e>
nnoremap <Up> <C-y>
nnoremap <Down> <C-e>


"""""""""""""""""""""
"      Plugins      "
"""""""""""""""""""""

" vim-go
let g:go_fmt_command = "goimports"
let g:go_def_mode='gopls'

What can I do to speed this up?