Yes they do, all (bigger) high aspect kites turn slow...
But when done right, the high aspect ones can jump higher
Bar pressure is a matter of design only so you can have light or heavy bar pressure, but you can never overcome the turning issue.
You can make a high AR kite turn on a dime, also a foil kite, but they will lose speed and power as this is done by "pivoting" the kite, meaning using one side of the kite as a "brake" to get it turned around in a tight curve, but slow thus not much power.
So things are balanced as always, ups and downs and you can not get both but have to choose or get something in between