Since Android phones are no longer mounted as an external drive I'm having an issue with a copying of large amount of photos from the phone (no matter what - LG G3, Galaxy S7) to the laptop (Windows 10).
It starts at pretty good speed - I can see file name changing 3-4 times per second in the copying dialog - and then getting slower and slower till the moment when single file name could be displayed for up to 10 sec.
I would probably just live with it but I found that laptop's performance degrades as well during this process as copying brings 99% disk utilization while transfer speed is far below the maximum for the SSD:
How to track down and fix the reason it is happening?