Nighthawk 1900 router cm1000 modem Slow wireless fast wired.

[Resketch1]

230mbps wired on pc (2.4ghz)
45mbps wireless (both 2.4ghz/5ghz)
Isp: Comcast, blast pro tier up to 200mbps
Tried all the basic techniques to increase wifi speed such as channel changing, Google dns, multiple talks with xfinity/netgear-support/technicians, router placement, Antenna adjusting, simple rebooting, etc... overall my plan,router,modem are all monsters but not performing like a monster

[vkdelta]

so it looks like no CM1000 issue since you are getting >200 Mbps wired.

what wireless client do you have? 

Did you turn on Keyword blocking?

Did you try performance in factory default condition?