Eli,
I also had performance issues after the logbook was switched to true 
parsing instead of regular expressions.  In my case, I had logbook 
entries going back to 2012!

After I cleared out the excess entries the performance jumped back up.

https://git.savannah.gnu.org/cgit/emacs/org-mode.git/commit/?id=3790bf8ea1d070055a989f0b9587948e07877977

On 12/4/22 11:41, Ihor Radchenko wrote:
> Eli Qian <eli.q.qian@gmail.com> writes:
>
>> Any idea about speeding up clocking in?
> Try reducing `org-element--cache-self-verify-frequency' to a smaller
> number.
>