Hi Ihor,

I tried to run that code but get errors for the elp-instrument-function​ calls 
(both with my config and emacs -Q​):

```
Debugger entered--Lisp error: (error "ELP cannot profile the function: 
org-cite-basic--g...")
  error("ELP cannot profile the function: %s" org-cite-basic--get-entry)
  elp-instrument-function(org-cite-basic--get-entry)
  (progn (elp-instrument-function #'org-cite-basic--get-entry))
  elisp--eval-last-sexp(nil)
  eval-last-sexp(nil)
  funcall-interactively(eval-last-sexp nil)
  command-execute(eval-last-sexp)
```

Best,
Jamie
________________________________
From: Ihor Radchenko <yanta...@gmail.com>
Sent: Saturday, March 19, 2022 8:28 AM
To: Jamie Matthews <jdm...@cam.ac.uk>
Cc: emacs-orgmode@gnu.org <emacs-orgmode@gnu.org>
Subject: Re: [BUG] org-cite: 10 second hang opening a ~4k org file with 10MB 
bibtex library [9.5.2 (9.5.2-g91681f @ 
/home/jdm204/.config/emacs/straight/build/org/)]

Jamie Matthews <jdm...@cam.ac.uk> writes:

> # Issue
> Starting emacs with emacs -Q​, then navigating to a minimal example org file 
> with C-x C-f​ yields a ~10 second hang on an 8-core/16GB RAM machine with 
> nothing else running. Also, scrolling commands like C-v​ are often laggy 
> after the initial hang.
>
> The minimal org file begins:
> """
> #+bibliography: ~/cloud/library/lib.bib
>
> [cite:@tillyPrimaryAnaplasticLargeCell1997]
> """
> with another 80 citations afterwards, one-by-line, but nothing else. As 
> mentioned in the title, the lib.bib file is ~10MB - if I swap this out for a 
> non-existent or tiny bibtex file the problem goes away, and the in-buffer 
> citations are rendered in a red face. Clearly from this and the below profile 
> the issue is something to do with checking etc the citations for 
> fontification purposes.
>
> # profile
>
> ## cpu
>   1,542,542,267  99%           - org-cite-basic-activate
>     787,037,416  50%            - org-cite-basic--get-entry
>       4,065,194   0%             + org-cite-basic--parse-bibliography
>     754,769,872  48%            - org-cite-basic--all-keys

Could you try the following:

1. Execute the following code:

(require 'elp)
(elp-restore-all)
(elp-instrument-function #'org-cite-basic--get-entry)
(elp-instrument-function #'org-cite-basic-activate)
(elp-instrument-function #'org-cite-basic--parse-bibliography)
(elp-instrument-function #'org-cite-basic--all-keys)

2. Open your org file where Emacs hangs
3. Run M-x elp-results
4. Report the ELP buffer contents here

Best,
Ihor

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