So I updated my S5 to Android 6.0.1 using Cyanogenmod, and I’ve noticed some slight lagging. Apps tend to close themselves randomly, normally when less apps are running than on Android  5.1.1. Also, when using the tethered connection, there’s some lag there too, causing my online games to judder. Though that part is only hypothetical, I’m going to test this by downgrading my phone back to 5.1 and verifying whether there’s lag on my connection there. If there isn’t, I’ll report this as a bug.