Biggest problem with iCue is the damn corsair.service, it may use a small amount but because it's using a decent amount of the CPU it doesn't let the CPU downclock for long, therefore more power and heat for no reason.
This is when the 9900k is at 5ghz, the two corsair services while the program is closed and in the tray is using almost as much as tons of other programs that are running in the background excluding the game running, just ridiculous.
iCue while in the tray is the only program that forces my CPU to run at it's full boost clock pretty often, program is just getting bloated unfortunately. I really miss the old Corsair Link, while it doesn't have the functionality for modern devices it ran quietly in the background without hogging my CPU, even when open.