Very slow performance with San Disk 3.2 Gen 1

I'm not sure that USB stick is very fast. The product documentation never mentions the actual write speeds which usually means writing will be extremely slow. Manufacturers like to advertise fast speeds whenever possible. The only mention of speeds is in reference to the read speeds up to 400MB/s (only applies to the larger sized USB sticks)....here is a screenshot of the relevant section:

Even the product data sheet never mentions a write speed, just a maximum transfer speeds up to 400MB/s. I would not trust a product which does not clearly state the maximum write speeds since write speeds are usually slower than the read speeds.

WD/SanDisk do make a USB stick that is advertised as being able to write to about 380MB/s, but AFAIK, there is only the one model which is the Pro (it is hard to be sure since the WD website has terrible filters to search for this):

https://www.westerndigital.com/en-gb/products/usb-flash-drives/sandisk-extreme-pro-usb-3-2#SDCZ880-512G-G46

That's probably as fast that that flash drive will go. Some of those very tiny drives are very slow.

Please post a link to the exact product page since I cannot find anything for "SanDisk slim fit".