mac + tmux + vim soooo slow

[dragonxlwang]

I am using a mac. When using vim in tmux (actually macvim in iterm2/terminal), vim motion becomes extra slow, no mention with mouth scrolling.

It seems to have something to do with vertical split windows in vim. If more than one window vertically split, then the slow is significant.

I have tried so far the following (1 being most slow while 10 being fastest):

1. Gui MacVin: 10
2. No tmux; iTerm2 / Terminal + Mac + MacVim: 8
3. No tmux; iTerm2 / Terminal + Mac + Apple's Vim: 6
4. Gnu-Screen + iTerm2 / Terminal + Mac + MacVim: 8
5. Tmux + iTerm2 / Terminal + Mac + MacVim (only 1 window): 4-5
6. Tmux + iTerm2 / Terminal + Mac + MacVim (only 2 window horizontally): 3-4
7. Tmux + iTerm2 / Terminal + Mac + MacVim (2 window vertically): 2
8. Tmux + iTerm2 / Terminal + Mac + MacVim (2+ window vertically): 1 (or even worse)

I admit that I have some plugins that I use a lot in vim. If I don't use any of them, then the speed becomes normal (10) again. If anyone want to reproduce, here's the list:

ListToggle
Vundle.vim
YCM-Generator
YankRing.vim
YouCompleteMe
auto-pairs
ctrlp.vim
gist-vim
indentLine
nerdtree
nerdtree-git-plugin
tabular
tagbar
ultisnips
vim-airline
vim-airline-themes
vim-autoformat
vim-bbye
vim-better-whitespace
vim-bracketed-paste
vim-coffee-script
vim-colorschemes
vim-commentary
vim-eunuch
vim-flake8
vim-fugitive
vim-gitgutter
vim-minimap
vim-snippets
vim-surround
vim-syntax-extra
webapi-vim

[ntnn]

Eliminate plugin by plugin until you find the culprit. Not really a tmux issue when the problem is with a program where you yourself said that it works fine without plugins.

[dragonxlwang]

I tried... even with simple plugin like vim-color-schemes the speed would slow down greatly.

[ntnn]

Either way, this is not a tmux issue. I'd suggest you go to the vim bugtracker and ask there for support.
And even there they will tell you to eliminate one plugin after the other until you know what is going on (or the other way around - add plugin by plugin until you found something).

[dragonxlwang]

I hope I have made it clear --- no matter which one single plugin I tried enabled, it slows down suddenly. I doubt this is related to any single plugins at all.

[ntnn]

Another helpful thing would be your configuration files.

[dragonxlwang]

Thanks, I will look into it… I even set escape time to be 0

https://gist.github.com/anonymous/5c50e58d9378f96d1f5a https://gist.github.com/anonymous/5c50e58d9378f96d1f5a

On Mar 29, 2016, at 12:55 AM, Nelo-T. Wallus notifications@github.com wrote:

Another helpful thing would be your configuration files.

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Reply to this email directly or view it on GitHub #353 (comment)

[ntnn]

# use "xterm-256color" instead of "screen-256color"
set -g default-terminal "xterm-256color"

Set TERM to an appropriate value, which is either a variant of screen
or tmux, depending on how recent your ncurses is.

[dragonxlwang]

sorry ... I have no idea which documentation you are referring to. But you are right, if I change it to screen-256color it becomes better though not as fast as in gui macvim.

I remember I set it to xterm-256color to be compatible with iterm...

Could you give me a pointer?

[ntnn]

Manual:

default-terminal terminal
    Set the default terminal for new windows created in this
    session - the default value of the TERM environment vari-
    able.  For tmux to work correctly, this must be set to
    `screen', `tmux' or a derivative of them.

FAQ (right at the start):

tmux frequently asked questions

******************************************************************************
* PLEASE NOTE: most display problems are due to incorrect TERM! Before       *
* reporting problems make SURE that TERM settings are correct inside and     *
* outside tmux.                                                              *
*                                                                            *
* Inside tmux TERM must be "screen" or similar (such as "screen-256color").  *
* Don't bother reporting problems where it isn't!                            *
*                                                                            *
* Outside, it must match your terminal: particularly, use "rxvt" for rxvt    *
* and derivatives.                                                           *
******************************************************************************

Your problem most likely entirely comes from heavy misconfiguration.

[dragonxlwang]

My bad --- never saw that faq before. I installed tmux from homebrew... i will see what's wrong with xterm there..

[dragonxlwang]

@ntnn, sorry for my carelessness of not reading the FAQ first!

I went over again the manual which is really helpful. But I am still not very clear why xterm is not allowed to be set "inside" tmux as when search .tmux.conf in github there are soooo many people using xterm-256colors yet (which I assume they are wrong?)

Also about the vim speed problem. It seems that by changing it to screen-256colors it doesn't really solve the problem yet...

[ntnn]

@dragonxlwang yes, they are doing it wrong. Screens' and xterms'
terminfo are close enough not to cause problems all the time, but they
differ greatly.

You'll also have to check what your term is outside of tmux. It has to
match what your term actually uses as terminfo (this should be set
correctly by default).

After that you'll have to go over your plugins again, disabling/enabling
one by one, and I'd need to see your vim configuration to see if
something is off there.

[dragonxlwang]

You'll also have to check what your term is outside of tmux. It has to
match what your term actually uses as terminfo (this should be set
correctly by default).

Well, this is one part I am a bit confused. Not sure what exactly it means by "outside tmux" I saw that a lot in FAQ as well. I am using iTerm2, and if not using tmux, TERM is set to xterm-256colors. How can I match term outside tmux? should I alias tmux="TERM xterm-256colors tmux"? Or I am already all set?

After that you'll have to go over your plugins again, disabling/enabling
one by one, and I'd need to see your vim configuration to see if
something is off there.

Yes. Hope this can be solved by remove only a few plugins.

A Million thanks!

[josefnpat]

There's a lot of patience in this thread

[dragonxlwang]

@josefnpat sorry if you think I've abused this place ...