Sloooow translation in version 9

For the past year (or more) in-line translation has been incredibly slow. It usually takes 1-3 minutes to translate even a short email. It was always very fast in the past (basically instantaneous as it should be). How do I fix this? Is version 10 any faster? (not that I should have to pay for an upgrade to fix a feature that stopped working)

I a usually translating CZ to EN, but have had the same issue with DE to EN as well.