reported earlier F4U Corsair Multiplayer Landing Gear Bug.

[Dauntless 7]

When flying the F-4U in MP, the aircraft is impossible to get above 200 knot indicated.
A check of the external view of other player F4U's shows the landing gear extended on all of them.
This is despite the gear appearing up on the players own F2 view as well as according to cockpit instruments. 
Suspect that the sim is seeing player landing gear as down and thus limiting maximum speed.

[1bis0]

A friend and I suspected the same but its only a visual bug. Extending and retracting the gear has effects on aerodynamics.

What got us higher speeds was mainly retracting cowling flaps and the other cooling flaps. They apparantly create a lot of drag.
After retracting those we got to 300 kts quite easily.

I cant say how realistic the effect is but I would expect that exposing so much surface area to the air stream with all the coolers will limit your speed.