Hello, I'm Greg, here to help you with this.
The reason Indexing may be slow is it's meant to be done in the background so it doesn't slow down whatever you're doing at the time.
To speed up Rebuild Index see here:
https://office-watch.com/2022/force-windows-ind...
https://www.howtogeek.com/808/speed-up-or-disab...
https://www.faqforge.com/windows/windows-10/how...
https://www.makeuseof.com/windows-search-is-too...
You can also always try to change the priority of Search Index process running in the Task Manager: https://www.wikihow.com/Change-Process-Prioriti...
Feel free to ask back any questions. Based on the results you post back, I will have other suggestions if necessary.
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