Bring on all anecdotal data you may have.
I go first:
I run Ubuntu 17.10 on a HP EliteBook 840 G3 (i7-6500U 2.5GHz / 16GB RAM).
As a software developer I have some IDEs, VMs and git as my daily applications. After updating to kernel 4.13.0-25 (fixing most of the vulnerabilities I understand) I see a 100% slow-down in git operations (stuff that previously took 2 seconds now take 4-5 seconds, most notably checking out from the server) and some file-indexing operations in the IDEs are slow to complete but not much else.
Seems like disk and network took the most punishment.
Anyone else noticed any major slow-downs?