I apologize for any frustration closing the thread you mentioned may have caused.
Based on the information inside of the post you linked here the problem was related to adjusted the speed above 1K with manual settings. As @bansai8creations mentioned, this behavior is because the higher speed the head has to move further to transition from line to line, the longer the print will take.
However, the trouble you are outlining in this post is still one that we are investigating in this thread. Once we have additional information regarding the snag you are hitting, we will reach out with additional information. I will also make sure I update that thread as well.
I’ll close this particular thread to ensure that we keep all of the right information related to the trouble you are outlining here, on the other thread.
Thank you!