I'm also going to advocate for @thunderbird obtaining eco-certification from Blue Angel, a leading Eco label in Germany. And I have a wonderful friend at @kde who's standing by to help with testing and submission processes!
Shaving those CPU-seconds off transaction time can have a MAJOR impact on the environment when you're talking about millions of users.
So yea... I had a lot to say. Stay tuned, I'll have more. . .