lsp-mode
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emacs-lsp
laggy and stuck on lsp initialization process
Thank you for the bug report
- [x] I am using the latest version of
lsp-moderelated packages. - [x] I checked FAQ and Troubleshooting sections
- [x] You may also try reproduce the issue using clean environment using the following command:
M-x lsp-start-plain
Bug description
When I newly open a rust project, then start lsp, emacs will be laggy and stuck, it seems that rust-analzyer is sending to emacs many lsp message, and lsp-mode is processing the lsp message, cause emacs stuck.
Steps to reproduce
- git clone https://github.com/zed-industries/zed
- use emacs to open that project, open crates/zed/src/main.rs file
- launch lsp, then you can do cursor navigation, then you will feel the lsp-mode's initialization cause emacs laggy and stuck for about 10 seconds.
Expected behavior
lsp-mode should't cause emacs stuck and laggy.
Which Language Server did you use?
rust-analyzer
OS
Linux
Error callstack
I do profiling during the lsp initialization stuck:
581068 95% - #<interpreted-function BDD5>
581068 95% - let
579178 94% - while
575402 94% - if
575402 94% - let*
574804 94% - if
555983 91% - prog1
545675 89% setq
18821 3% - progn
12458 2% - setq
1525 0% - lsp--get-body-length
1327 0% - mapcar
1228 0% - lsp--parse-header
1228 0% - let
830 0% - if
731 0% - progn
731 0% - progn
731 0% - or
731 0% - let*
300 0% - while
300 0% - and
200 0% - setq
100 0% 1+
100 0% <
199 0% - progn
199 0% - setq
100 0% s-trim-left
100 0% string-match
99 0% - split-string
99 0% - substring
Anything else?
Another profiling:
6885379 82% - #<interpreted-function 779>
6884981 82% - let
6827840 81% - while
6792923 81% - if
6792524 81% - let*
6789883 81% - if
4366549 52% - prog1
1720587 20% - setq
199 0% substring
100 0% substring
2423206 28% - progn
2223457 26% - condition-case
2223357 26% - let
2222792 26% - save-current-buffer
2211372 26% - unwind-protect
2206418 26% - progn
1663071 19% - setq
1662771 19% - cons
592 0% json-parse-buffer
16634 0% - decode-coding-region
10824 0% - symbol-overlay-refresh
398 0% - if
198 0% - or
198 0% - not
198 0% or
14815 0% - apply
14518 0% - insert
10561 0% symbol-overlay-refresh
198 0% - nreverse
198 0% prog1
199 0% goto-char
4854 0% - work-buffer--release
882 0% - symbol-overlay-refresh
485 0% - if
Can you try to go to lsp-mode.el and do a M-x eval-buffer then try to reinitialize the rust lsp again with profile taken?
That would expand the function name more and give us more point to investigate.
Can you try to go to
lsp-mode.eland do aM-x eval-bufferthen try to reinitialize the rust lsp again with profile taken? That would expand the function name more and give us more point to investigate.
2355589 93% - #<interpreted-function C61>
2355490 93% - let
2334195 92% - while
2316726 92% - if
2316626 92% - let*
2314950 92% - if
1172536 46% - progn
610887 24% - setq
579275 23% - lsp--get-body-length
578220 23% - mapcar
574234 22% - lsp--parse-header
9940 0% - let
5086 0% - progn
4689 0% - setq
4590 0% - s-trim-left
99 0% substring
99 0% - #<byte-code-function 9CF9>
99 0% set-match-data
3335 0% - if
3135 0% - progn
3135 0% - progn
3135 0% - or
3135 0% - let*
2180 0% - while
1882 0% - and
1190 0% - progn
893 0% - if
299 0% - or
100 0% >
297 0% setq
299 0% <
200 0% - setq
100 0% 1+
600 0% string-match
1103 0% - split-string
200 0% string-match
198 0% - substring
99 0% - or
99 0% string-search
814 0% - let
318 0% - cdr
99 0% assoc
199 0% - if
199 0% string-to-number
99 0% - substring
99 0% +
561551 22% - condition-case
561257 22% - let
560859 22% - save-current-buffer
556496 22% - unwind-protect
555801 22% - progn
548190 21% - setq
548190 21% - cons
496 0% - json-parse-buffer
100 0% if
1873 0% - apply
1177 0% - insert
406 0% - symbol-overlay-refresh
307 0% - if
307 0% - or
208 0% - not
99 0% - lsp--client-disabled-p
99 0% - seq-some
99 0% - function
99 0% - cconv-make-interpreted-closure
99 0% - cconv-fv
99 0% - cconv-analyze-form
99 0% - cconv--analyze-function
99 0% - cconv-analyze-form
99 0% - cconv-analyze-form
99 0% - cconv-analyze-form
99 0% - cconv-analyze-form
99 0% - #<byte-code-function 4D7>
99 0% - cconv-analyze-form
I ask claude: https://claude.ai/public/artifacts/e05b6d34-0f78-4319-9c58-67a860fa266e