@MM625 I played around with your LayOut file a bit and it didn’t seem any slower than my files of the same size (15MB). The slowness you are experiencing is unfortunately the norm, an issue that has been widely discussed in the forum, for example here.
I did find, however, that LayOut runs faster when the file is stored on a local drive. Apparently it doesn’t like NAS / networks, at least not mine.
Others have also indicated that a SSD drive helps. Good luck!