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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2
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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 ...
9
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2answers
2k views

org-babel result to a separate buffer

I use org-babel to generate some reports which can't be automatically processed, and since org is a good outline format, I print the results in org to represent them as trees. I've noticed that ...
2
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2answers
647 views

Why emacs multiplication performance is so bad?

I compared two versions of loop in emacs and in C. Emacs byte-compiled version gives 4.5 seconds, C version gives 0.22 seconds. Why so slow? How to optimize it? Emacs version: ;; -*- lexical-...
1
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1answer
126 views

Cancel printing of long string in buffer

Sometimes when in e.g. a Python or SQL buffer I accidentally evaluate something that outputs e.g. multiple megabytes of text into the buffer. >>> zps = _read_zipfile_container(br.response()....
0
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1answer
618 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 ...
5
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0answers
521 views

Ways to make Emacs feel snappy as Vim? [closed]

When I switched to Emacs from Vim, I really loved the extensibility of Emacs. But compared with Vim, Emacs still feels somewhat sluggish. Especially when I moved my pointer/cursor around, and typing ...
1
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2answers
385 views

s3fs is too slow for emacs

I have set up a mount point using the s3fs FUSE filesystem and autofs to talk to an Amazon S3 bucket, but it is excruciatingly slow to edit a file in the bucket in emacs - it is basically unusable due ...
4
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1answer
722 views

is 64 bit Windows actually faster?

Installing Windows 64 bit for Windows 7 is currently a massive pain Where is official 64-bit Emacs for Windows? (The manual said there is!) because although there are many roque cuts, GNU are not ...
42
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3answers
4k views

What can I do to speed up my start-up?

What are some basic things I could do to reduce the start-up time? Is there anything in particular I should pay attention to, for that matter? Note: Startup time can be mitigated by starting Emacs ...
3
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0answers
136 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 ...
4
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2answers
71 views

avoid emacs to lock down or crash when used for many tasks

I consider to start using emacs for IRC, SQL, Shell and maybe twitter and Feed reading. But than I wonder how power users of emacs deal with emacs being single threaded. So if I have one long-running ...
3
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1answer
288 views

Debugging open file handles in emacs

Is there a way I can find what file handles emacs has open, and close these references? Or even better, find where they are being open? Emacs is keeping handles to a large number of files (a leak) ...
2
votes
1answer
224 views

Size of process output sent to filter functions

I'm using comint to communicate with a REPL. From time to time the REPL sends large amounts of data. This causes a significant lag (about one second), because my filter function gets called on a ...
2
votes
1answer
217 views

Setting faces is slow?

I'm seeing rather bizarre behavior. I have the following code: (defun set-mode-line-face () (let ((color (pcase (random 6) (`1 '("#586e75" . "#eee8d5")) (`2 '("#...
10
votes
1answer
541 views

`looking-back` performance

I have some code using (looking-back … (line-beginning-position)). Doc string of looking-back states that it's better to avoid this function because of slowness. I'm curious will following approach ...
2
votes
1answer
222 views

auto-complete mode performance is awful in nxml-mode

Performance used to be OK, but a couple of weeks ago the performance got much worse. Some experimentation showed that it's auto-complete-mode in XML files. When I type, it now takes a second or two ...
15
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2answers
2k views

How to prevent slow-down when an inferior processes generates long lines?

I use Emacs with Geiser to hack on some Scheme code. As I'm playing around in the REPL I sometimes evaluate expressions that result in a lot of output, often all on one line. For example, I just ...
13
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2answers
2k views

practical limits on org-mode file size?

I have an org-mode file that's running around 6,000 lines with a hundred or so top-level headlines. It's started to take around a minute to load or save, and occasionally it sends emacs into the weeds ...
8
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1answer
1k views

“Making tag completion table” Freezes/Blocks — how to disable

TLDR: I've got a large tags file that loads multiple times per session, making it unusable. Can't find the source of issue or how to disable it -- main goal is to jump to tags, but completion would ...
23
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1answer
2k views

What algorithm does sort use?

I need to add a single integer to a list that's already sorted, such that it goes in the right place. My first tought was something like (sort (cons newelt list) #'<) However, given that list is ...
6
votes
1answer
372 views

What are the advantages of building Emacs from source?

I use precompiled Emacs binaries (24.3) right now. AFAIK, v24.4 is already available as binaries, so there is no incentive for me to compile Emacs myself to stay current. I'm thinking, however, ...
10
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1answer
230 views

Are there any pre-existing benchmark suites for Emacs itself?

(This question is not about writing benchmarks/profiling elisp code, for that, see this question.) Do any benchmark suites exist for Emacs performance? I'm looking for something equivalent to the V8 ...

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