How to rotate SVG 90 degrees?

Question

css

Hello! Faced such a problem. There is a layout map in svg and the task is to rotate it 90 degrees counterclockwise. It will take a very long time to redraw, because there are more than 100 different groups of paths in the container.
Using transform: rotate is not an option either. it heavily loads the browser and the svg itself loses a lot of quality. What are the exits?

Answer 1

transform: rotate(угол)

Answer 2

what is the problem with opening in the editor and rotating?)