#2 impossible to download big zip archive

[nonoriri]

The download zip archives feature does not work in my case.
After 60s, the client browser give up.
I guess it is because the server is supposed to generate dynamically a zip of 80MBytes which takes too long.
If my understanding is right, this case may happen very often.
So the server must keep the client informed that it is computing and keep the connection alive. A rough progress bar would be nice.
Maybe it is very computing intensive to build a zip archive when we only need an archive; why not using a "tar" archive ?