Am I flying as fast and efficient as I can here?

Autopilot is on flying via GPS NAV and holding 4000ft.

Seems like I cant raise the collective anymore or I will go into the yellow/red for M/R Torque but for the Engines OEI 1+2 I have alot of room with green. Anything I can do here to fly faster cause it seems slow for the 222. Only 90kts. I know helicopters are not speed demons but I thought the 222 could cruise a bit faster than 90 kts while staying within parameters.