Hi there!

What does it means "suspension rising slowly". Why?

It means that your air reservior pressure is low so the vehicle is struggling to raise itself to the requested suspension level.

Nothing to worry about really, unless you are getting this message everytime you get in the vehicle. Try letting the engine idle for five or ten minutes next time you start up, before raising the suspension from entrance / exit mode. Arctic Frost TDV6 SE. Aspen Leather, Cherry Wood, Privacy Glass, PTI, Tow Pack, Mudflaps, Tasmods, a new Fuelflap, a RRSport.co.uk umbrella in the boot & a RRSport.co.uk sticker on the rear glass.
__________________

Some people accuse me of thinking the world revolves around me, but I'm not stupid . . . I know it revolves around the sun. Which shines out of my @rse!!!

I had this along with various other suspension errors, I had to have my suspension ECU and a couple of ride height sensors changed under warranty.

TB's advice makes sense.  Malaysia Boleh!
4.2SC Chawton White, Stormers
Tasmod's Sills, Wind Deflectors, LR Sills
Clear Side Repeaters, Towbar
Larini Sports Exhaust, K&N Air Filter
______________________________
WINNER - 2008 'Tech-Head Of The Year' Award
WINNER - 2009 Outstanding Contribution
WINNER - 2009 'Tech-Head Of The Year' Award

It also happened to me... and it makes squeky noises.
And after a few days, when I tried it again, everything was fine  RANGE ROVER, MORE THAN A CAR, LESS THAN A KITKAT