Why did Apsense die?

You do not say "DEAD", the changes come, think about how to improve and come up with better ways.

Yes, the site is incredibly slow now. Hopefully the service improve soon.

The response speed has become weak, unlike the past, when it was very fast

I Know A Lot Of Features Have Been Removed But I Wouldn't Consider It Dead.

In the past it was interesting and interactive

It's definitely not dead. But unfortunately it does not always get the desired results. There is too much focus on advertising of one's own programs (yes, I am also guilty of that) and not enough people actually reading and looking at others'. I hope Wincer's planned changes will be a success

We are working on New APSense, lots of new features will be added.

But many good programs have been cancelled

APSense isn't dead ... you just have to learn how to make better use of all the things one can make good use of here. Maybe you like to tell a few friends and start some new projects to show the world your own brain is still working ... lol