|Jan 28, 2010, 11:48 PM||#1|
slow scroll speed in vim running within Terminal
I have tried Terminator, iTerm, mrxvt, GLTerm mentioned at the
following page as alternatives to Mac OS X Terminal.app:
I have also tried putty on Mac OS X.
But all of these terminals along with native Mac OS Terminal.app suffer the same slowness while scrolling down a file in vim editor.
As a comparison data point, I can scroll 300 lines in 10 seconds when
I use putty on windows. But all the terminals including native
Terminal.app on Mac OS X 10.6.1 can scroll only 120 lines in 10
To many people this may not seem like a big deal, but being a
professional developer that makes a huge difference to me as I can
feel the sluggish left-right-up-down movement in vim.
In your opinion what do you think the root cause may be?
Do you know of any terminal application on Mac OS X, which can match
putty on windows in terms of scroll speed?
And if it's a Mac OS X GUI limitation, when is Apple going to improve this?
|Mar 9, 2010, 12:05 PM||#5|
Using Vim in Terminal.app, I can easily scroll about 5100 lines in 10 seconds, using ctrl-F or ctrl-B (scroll one page forward or back), if you're trying to move a long distance in a hurry. I get the same speed in MacVim (which can update the screen much faster than Terminal.app), so I'm pretty certain that the limiting factor (at least in MacVim) is the keyboard repeat rate, not Vim's ability to update the screen.
The only way I get roughly 120 lines in 10 seconds, is scrolling Vim (or MacVim) line-at-a-time by holding down "j" or the down arrow, and that's clearly the default keyboard repeat rate (about 12 per second) limiting things.
You can easily adjust the keyboard repeat rate in System Preferences, in the Keyboard pane, by fiddling with "Key Repeat Rate" and "Delay Until Repeat". But I've been using Vi/Vim/MacVim for a loooong time, and have never felt the need to have the keyboard repeat faster; the key (no pun intended) is to use Vim as it was intended...
Finally, nearly everything in Vim (and Vi before it) takes a repeat count argument. If what you want is really to jump 179 lines down, then type "179j" (and if you wanted to get to line 423, that's "423G"). Use the full power of Vim as it was intended, and keyboard repeat rate will never be a limiting factor.
And if you're using Vim on the Mac extensively, you owe it to yourself to check out MacVim -- you can still start it from Terminal.app (an included helper script lets you type "mvim file1 [ file2... ]" at a command line prompt), but it's much more Mac-like -- cut'n'paste and drag'n'drop interact well with other programs, you get real scroll bars (drag those to move through a file really quickly), multiple editing windows, and you can use the mouse for selecting text, along with (practically) unlimited colors for color syntax highlighting (you do use that, right? ":help syntax" or just ":syn on" to switch it on), instead of the 16 colors you're limited to in Terminal.app. And it's fast.
Vim (and MacVim) is the ultimate programmer's editor, if you take the time to really learn how to use it -- it requires the smallest amount of hand movement to make changes (especially since one never has to reach for the mouse), it's insanely customizable/programmable, and it has a very smartly laid out command set -- yes, it has a steep learning curve, but for something that I use 10 hours a day, I'll take easy/powerful to use over easy to learn any day.
Last edited by CarlJ; Mar 9, 2010 at 12:28 PM.
|Mar 16, 2010, 09:20 PM||#7|
Thanks for all the responses, especially Carl's. "Key Repeat Rate" and "Delay Until Repeat" was the root cause. This was what I was looking for.
Now the vim's maximum one-line-at-a-time scroll speed is the same in both, putty running in Windows and Terminal.app running on Mac OS. It's 30 lines per second.
|Jul 13, 2010, 04:09 PM||#9|
You may have managed to shake something loose by swapping out Terminal.app, but... correlation does not imply causation -- I'm running Mac OS X 10.6.4, the corresponding Terminal.app 2.1.1 in 64-bit mode, and the system-supplied Vim (v7.2), and it scrolls really blazingly fast (as seen by scrolling with ^D & ^U or ^F & ^B), with syntax highlighting or without. Scrolling line-at-a-time with J & K or the arrow keys goes just as fast as the system's key repeat rate allows -- neither Vim nor Terminal.app are the limiting factors for line-at-a-time scrolling speed.
And I haven't seen any scrolling slowdowns in any prior 10.6.x version of Terminal.app, either.
By the way, if you want hideously fast scrolling, along with real Mac-style scroll-bars and cut'n'paste and more-than-16 color syntax highlighting, seriously check out MacVim.
|Jul 15, 2010, 01:29 PM||#10|
it is indeed sluggish
The issue I'm having is, the Terminal.app became extremely sluggish when it have to render some color texts. When I turn-off syntax coloring, the speed of vim back to normal. When I turn-on syntax coloring, it takes a couple seconds to scroll one line up. And it is not even limited to vim. I experience sluggishness in the shell as well when directory listing is colorized.
It wasn't like this at day 1 of snow leopard, but at some point, I started experience this. At first, I thought it is some sort of network glitches, but when I accidentally turned off the syntax coloring, the speed of vim got much much faster. That is how I came to aware of this. And I've been using X11's xterm instead.
Today, to my surprise, I have changed the theme of the Terminal.app and the issue is suddenly gone. My default theme was Novel and I've changed the default theme as Basic and quit the process and restarted the Terminal.app and color text rendering is not slow anymore. Curiously, if I start another window using Novel theme after the first window is opened as Basic, it is not slow. However, if I changed the default theme as Novel and quit/restart the Terminal.app, it is again slow. So I guess I'll be stick with Basic for now.
Hope this is helpful to some one.
|Dec 1, 2012, 09:47 PM||#11|
turn off opacity on your terminal window settings
if you have opacity on your terminal windows, this will make vim scrolling slow. i struggle with this for almost a year; now i'm back to full speed. i actually started using macvim :/ back to term!
|Dec 2, 2012, 12:11 AM||#12|
Sorry for posting on a 2+ year old original posting...
Last edited by switon; Dec 2, 2012 at 11:35 AM. Reason: removed because original post was 2+ years old...
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