Questions tagged [performance]

is for Emacs performance-related issues. Use additional tags to indicate which aspects of Emacs the performance issue is about: startup, navigation, search, screen updates, compilation, execution, debugging, and so on.

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Performantly filter against a custom time-like property

My agenda view processes many items with SCHEDULED and DEADLINE fields, and fully generates from scratch in about 0.3s. However, if I append CUSTOM_SCHEDULED<"<now>" to my agenda view ...
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46 views

How are unrelated modes enabled?

I've been an emacs user for about a year now and I use it for Haskell programming. I chose to go the vanilla emacs route and customized a plain init file as I went along. Over time, however, I ...
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217 views

Remove scrollbar, faster

I like a clean interface. One without the clutter of scroll bars, or menu bars. So, to remove them, I have the following in my init.el (progn (menu-bar-mode -1) (scroll-bar-mode -1) (tooltip-...
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82 views

C++-mode indenting performance depends on length of previous function?

Using c++-mode in emacs23. UPDATE: In response to some early comments, I tested on emacs24 and emacs25, and see exactly the same behavior. I don't have convenient access to emacs26 or emacs27 (25 ...
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1answer
55 views

Profile performance for a given command

Say I create a quick keyboard macro, but find that executing it in quick succession is extremely slow. How can I determine in what functions or packages this command is spending most of its time? ...
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29 views

Emacs is extremly slow on battery, normal on power

I have a weird problem where my emacs setup is extremely slow (as in takes a long time to show typed characters) when my laptop is running on battery. Once I connect it to power, the speed is normal. ...
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1answer
25 views

Troubleshooting a hanging `list-processes`

Normally I'd use M-x list-processes to see what Emacs is running in the background. But in this case list-processes itself hangs. What is the right thing to do in this situation?
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11 views

Memoize with cache on filesystem persisted between sessions

The memoize package provides a memoize wrapper that installs a memoized function over the original functions. (memoize 'expensive-function) will replace expensive-function in place with a memoized ...
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40 views

Emacs stops displaying typing until focus moved out of and then back into editor window

I'm currently running RHEL 7.6 and whatever version of emacs comes with it (I don't have access to my system at the moment so can't provide the version number). Sometime in the last 2 weeks my sys ...
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93 views

Performance issue of c-mode

When I'm pressing C-p/n moving the cursor around, the redisplaying is quite lagging. A profile of CPU give + command-execute 527 59% - ...
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1answer
90 views

Speed issue with omnisharp go-to-definition

Getting a rather sizable speed issue with using go-to-definition from omnisharp. Ran the profiler, and received nearly 50% of the cpu time dedicated between: isearch-printing-char and omnisharp-go-...
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1answer
448 views

Debugging emacs 24.5 slow startup (WSL)

I'm running emacs24-nox on Ubuntu trusty on Windows Linux Subsystem, and I'm trying to figure out why the startup time is slow. I've inspected the startup with strace and found two calls to poll that ...
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110 views

Why is avy-goto-line so slow?

If I open a file with, say, 2 lines, then when I call avy-goto-line emacs shows me in the beginning of each line the keybinding to move the cursor over there. But try it in a bit longer file (I use a ...
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591 views

why tmux under ansi-term so slow?

I use colorized output in ghci. And if run it: in comint-mode, or in eshell, then colors displayed fine, but a lot of escape sequences displayed like ^A^Bλ ^A^B> ^A^B^B. in ansi-term, then I got ...

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