Unable to increase speed

Sorry if this is already a thread,

I keep seeing other aircraft cruising at 30,000 ft yet travelling at 400 knots or above . When I cruise at the same height I am not able to progress above 300 kts. Any help appreciated.

This is normal. The higher you go in altitude the lower your airspeed goes. But your ground speed should still be high.

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The displayed speed is ground speed not airspeed

Check the GS. Your probably going the same speed.

One thing, when you click on a plane during a flight in IF, the number showing their speed is showing ground speed, not air speed:) you can put your ground speed in the status bar on the bottom of your screen and your GS and the other pilots GS would be relatively the same depending on winds