Slow performance copying jar files

Hi l1nk2. Welcome to the forum

How big are those files?

How are you copying them? Using the GUI, or with a command in the terminal?

Are you trimming your SSD manually, or using the system schedule?

Is that a Samsung EVO SSD? Did you upgrade your firmware so it fixes the bug of slow access for files that you haven't touch in awhile?

Come here often, and have fun.
Regards.