if you, like me, get bored immediately after you execute copy scp x y, you’ll likely be happy to know that we’re introducing changes in the TCP/IP stack responsible for SCP operations.

in NX-OS beginning in 9.3(1), while copying using scp you can add use k-stack, like this:

nxos-switch#copy scp:// bootflash: use-kstack

in IOS-XE, starting from 17.2(1), it’s possible to achieve similar speed-up effect by enabling globally ip ssh bulk-mode. the same copy operation should speed up 4-5x over.