Ok I have had upgraded humming birds and the cab that boost power even have the co driver for power also I have noticed after this update my flyer is very sluggish even turning and i do use the tail rotor.No its not overweight 
and Flock half way works also with the hurricane spider cab combo XD
They are just slow.
The part description says that have a max speed of 90 km/h, which can be slightly increased by certain engines, but not by much.
I know there not super fast but they should be agile. well used to be agile…
I’ve only found them to have more stable flight than the others. It’s actually what I was testing the Dove and the new missile system with.
I do have the kensie cab and a Oppresor thats fuzed but even with the cab ability it feels sluggish seemed fine before the update
Even if you use the lightest cab and fastest motor they still seem slow and it’s been that way since they came out.
But i am saying its more sluggish now nothing has been changed on it
More sluggish as per before the update? If so report it, I didn’t really notice but don’t let that stop you:
https://community.gaijin.net/issues/p/crossout?from=now%252Fd-6mo&to=now%252Fd
Honestly if it’s something you found off tell them.