Your regular green speed stays "very fast".
That said, here's some universal advice on faster green speeds:
Adapt to green speed, roll the ball slower, with less power.
Be aware what the contour does to a slower ball:
- side breaks are more in effect,
- uphill putts need more relative extra power because gravitation did not change, Be aggressive.
- downhill putts need less relative power due to the same effect. Be defensive!
Have fun during practice!