Merge / import from bbpress - 5000 posts per hr only?

[Donald_Duck]

I always suggest: if you are doing merge then do on your local machine using xampp (localhost), later upload merged stuff on live production server.

It's faster, reliable..

I have an 8gig ram windows laptop.
a 32 gig ram more, faster processor server with a dedicated mysql hard drive and main drive is ssd too.

Server, is running almost nothing else.

That's awesome for the merge you will be performing, go for it