Rx3 issues

download link ere with problems... https://www.mediafire.com/file/u2caqvh11xaf8lz/westend_dj_.mp4/file

everything is updated, running catalina on mac 2017

samsung ssd , 300 gig of music on - 

i have about 15 folders , 

some folders have about 40 songs in ,but im waiting for at least 5 seconds each time the waveform preview loads , then if the ful screen isnt loaded i cant scroll , i tried it with 100 gig of choons on my ssd and still problems - see video

in export mode , the screen freezers ,crashes when scrolling - see video , 

in my old 16gig usb , i have no problems but this is a new cpu , this should handle loads of music , i tried my ssd in my cdj3000s , no problems, 

i had a rx2 and i had no problems 

i cant use it unless i have a low gig usb , its not ideal if you on a mobile disco