There may be one. However, I use DD with the bs option (block size). A script 
can be created easily enough in terminal to run it several times and then give 
the results each time. You will know when you pass the max file transfer 
efficiency hump when numbers start heading back downward. I will have to do a 
bit of looking to see how to create a script to do this.

In any case, there are tools for determining best transfer speed of a device 
given a few known parameters.

-Eric


> On Aug 6, 2021, at 3:23 PM, Matt Turner <meturner2...@gmail.com> wrote:
> 
> Hi, hope everyone is doing well.
> is there and app for this?
> 
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