Rekordbox 5 - slow loading waveforms, not responsive to clicks, slow loading tracks

MY CONFIGURATION

Here is my configuration info:

• Rekordbox 5.8.5
• Lenovo Yoga 920
• Windows 10 Home
• 16gb RAM
• Core i7 8th gen processor

I store all of my music on an external drive (4TB, USB3, formatted NTFS)

MY ISSUES

I have been plagued by

• slow response to clicking in the Rekordbox interface (Export and Performance modes!) -- a click on a track might take a second to highlight the track,
• slow loading tracks when you drag one to a deck (slow loading means that the waveform does not appear quickly)
• slow responses in Performance mode to use of the Browse control

This gets a little infuriating when you're busy picking tracks and keeping a dance floor moving!

WHAT I FOUND OUT TODAY

I needed to be able to set up for a main event and provide music beforehand at a different location. I decided to use my 2nd RB license to run it on another computer with my DDJ-400 backup unit. 

I did not want to have to move the hard drive with the music back and forth so I tried (for the first time) building a USB with playlists.

When the USB showed up under "Devices" in the Rekordbox tree I decided to play a few tracks just to see how it worked. And, the USB drive is a little 4GB throwaway device that is NOT USB3. This is NOT a high performance USB drive at all!

AMAZINGLY there were NO "slowdowns". Everything responded crisply and tracks loaded smoothly. Clicking on tracks NEVER caused a wait.

SO HERE IS THE 64GB QUESTION...

So the only difference between the situation where clicking causes waits, tracks are slow to load and the situation where clicking is crisp, tracks load quickly is the drive used to hold the music. One is NTFS (works bad!) and the other is FAT32 (works great).

So... there was a post on this forum from 2015 that said:

"In order for drives to be read by the player, they must be in FAT16, FAT32 or HFS+ format. While ExFAT and NTFS drives can be used by rekordbox for import and export, they are not compatible with the players.

FAT32 does support partition sizes of up to 8TB."

https://forums.pioneerdj.com/hc/en-us/community/posts/203066959--SOLVED-Rekordbox-won-t-detect-USB

This was from a Pioneer DJ forum person (it has a Pio DJ logo by it).

I note that this references the "players" (CDJs, XDJs) BUT WHAT ABOUT REKORDBOX?

So, can any Pioneer DJ engineer speak about that? Is it the case that my music should be stored on a FAT32 external drive?

Thanks in advance for reading this all the way to the end. Double thanks to anyone who might speak authoritatively on this subject.