What's new in Nuke 15.0 & 14.1

how to setup deadline for copycat,need to update to 10.3?

I wished they didn’t release version 15 until the new 3D system is complete.

Timestamps?

I've had this issue in Nuke, started when I updated to 14, and Nuke starts to lag whenever I copy-paste nodes, even when it's a new script I've started. the moment I reach a certain amount of node copies, it starts to lag, I can't even move from one frame to another without nuke freezing. any help on how to fix this?