@optimizingmatters – Thank you so much for your reply.
@vupdraft – Thank you for running the test to confirm that there is a performance conflict between the Bluehost and UpdraftPlus plugins. Bluehost support’s answer, however, is only partially correct. That plugin also allows the user to set up a staging environment where they can make changes to their website without it affecting the live site. Then, when the changes are complete, the live site can be updated all at once. For me, this was very helpful during the past year as I completely redesigned my website with the Divi theme. During that period, the UpdraftPlus plugin was working fine. It wasn’t until the beginning of July 2023 when the UpdraftPlus plugin stopped working properly. So it seems to me, either the UpdraftPlus plugin or the Bluehost plugin must have had an update sometime during that period to make the two incompatible.
On my site I will deactivate the Bluehost Plugin for now, since I am not using the staging environment at the moment. However, that does not seem to fix the overall problem. I’m sure others who are currently using the Bluehost and UpdraftPlus plugins together are experiencing this same issue.
Thank you again for all your help.