Here are links to the topics that discuss your questions:
I have not witnessed or read about anyone having a delay with their pressure reading. But I believe it does adjust itself to your local area so it may have been calibrating itself.
Many questions and answers have been discussed in this forum with no easy way to find a complete FAQ. Because this station is continually evolving and changing, even your own station will be automatically updated and calibrations will change and you wouldnt know it unless you read it here somewhere. I use the search bar a lot to find things out.