Slow import and conforming of files

I am using Premiere Pro 2021 running on a new Mac. Version 2021 is new to me (my previous Mac would only run up to 2017).  Importing and conforming files seems to take forever.  Especially slow is importing and converting captioned .mxf files, but all files seem slow to import and conform.  Is there a setting somewhere?  I took a suggestion and downloaded Premiere 2020 and that is faster at importing, but conforming is still slow.  Is there a place where i could download Premiere 2019?