Reply To: Comments not appearing immediately
It depends how you are replacing the WordPress comments with bbPress replies, if your using a plugin for this then I would look to the plugin being an issue and go to that plugins support forums to find any known issues.
If you are doing this manually using bbPress then per your original post here:
For the past two weeks or so I’ve had a problem in the forums on my site where members comments no longer appear immediately. It can take a while for them to appear. I’m not sure how long, but several minutes.
This could be a performance issue, I would start by running some tests on a test post, add a reply and time how long it takes to appear in your sites backend as you state that the ‘do appear’, just not immediately, try using the Twenty Fourteen theme and disable all your other plugins except bbPress and time how long it takes now.
You might find your theme and plugins and using all the resources available in your web hosting plan, if this is the case contact your host to see what options or suggestions they may have for you.