Very slow transfer speed from ipad pro to usb c flash drive

I use Sandisk usb-c flash drive formatted in exfat filesystem to backup my iPad pro 2020 but transferring files from iPad to the flash drive is very very slow. I don't want to format it in apfs file system because it won't be readable on windows pcs. Is there a solution for faster file transfer or Are there certain types of flash drives or external ssds that can make me transfer files faster?