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.
22
questions with no upvoted or accepted answers
7
votes
1answer
822 views
How to find what causes ESS to run very slow?
When working with an iESS session of R and an R file open side-by-side, I noticed extremely slow performance when typing indetifiers. Typing braces and operators is fine, however, when an identifier ...
4
votes
0answers
499 views
Find cause of cpu-usage?
Is there some way to find out, what in Emacs is causing spurious cpu usage?
Since a few days I notice Emacs retaining high CPU usage despite not being used actively, having no subprocesses, and not ...
4
votes
0answers
1k views
byte-compile much slower in X (vs. -nw)
Setup
Windows 10 host with X server (VcXsrv)
Linux guest (Arch) in virtual machine (VMware)
Benchmark
(defmacro measure-time (&rest body)
"Measure the time it takes to evaluate BODY."
`(let ...
3
votes
0answers
160 views
csv-mode is very slow
Just about any buffer with csv-mode enabled gets very slow/unresponsive, regardless of how big the file is. It takes up to half a second to jump to the next line/character. Any idea why that is?
I ...
3
votes
0answers
134 views
Profiling org-mode init file
My initialization file is organized in org-mode with src snippets. Is there a way I can profile it to see which snippets take the most time to evaluate? When my initialization file was in Elisp, I was ...
2
votes
0answers
120 views
hide-show with linum
When working on huge files, it seems that when hide-show collapses a large multi-line block, linum still creates hidden overlays for every line in the hidden block leading to unresponsive emacs. Is ...
2
votes
0answers
69 views
how can I debug or fix slowness in org-cycle?
running org-cycle appears to hang sometimes. I've run
M-x profiler-start
<tab> ;; bound to org-cycle
C-g ;; to cancel apparently-hung command
M-x profiler-report
and I see that a bunch of time ...
1
vote
1answer
73 views
Long Emacs start-up time (20~60s) on Windows 10
I have a working setup of emacs on Windows 10 that I like so far. However, I find that emacs start-up takes very long. It can be anywhere from 20s to 60s. I tried installing the benchmark-init package ...
1
vote
0answers
60 views
Poor performance with Tabbar
Tabbar is refreshing groups like 14+ times at once (probably number of tabs) and causing severe slowness with the mods I made on it (lots of IO to sort tabs in mod time). What is the preferred way to ...
1
vote
0answers
54 views
Debugging slow find-file performance
Trying to figure out why find-file (C-x C-f) operations are taking a long time on Windows 10 with emacs 26.3. I tried to do profiling and got following results.
- command-execute ...
1
vote
1answer
30 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?
1
vote
0answers
64 views
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 ...
1
vote
0answers
48 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 ...
1
vote
0answers
253 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-...
1
vote
0answers
91 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 ...
0
votes
0answers
28 views
emacsclient spending a lot of time resetting faces
When I launch emacsclient or make a new frame it spends ~2s in:
- make-frame 312 42%
- frame-creation-function ...
0
votes
0answers
21 views
Throttle transient-mark-mode highlighting?
When I'm using remote X forwarding to run X toolkit emacs and I press C-SPC and move the cursor around, things get very slow. The emacs profiler says all the time is spent in line-move-visual, but I ...
0
votes
0answers
34 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.
...
0
votes
0answers
12 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 ...
0
votes
0answers
112 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%
- ...
0
votes
1answer
98 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-...
0
votes
0answers
122 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 ...
