Is the AppSheet Audit Log, along with several other areas of the website, running slow for others in the last week or so?
In response to your question, I have just written a short article explaining the factors that affect Audit History display performance. See https://help.appsheet.com/troubleshooting/debugging-your-app/audit-history-performance
I suspect that your question may be more general than Audit History performance alone, but the article may still be helpful to you.
Good article, thank you.