tycho: Tycho 3.0.0 download speed is much slower as 2.7.5 if mirrors are used

@Phillipus I can verify your observation that Tycho 3+ is slower when downloading than Tycho 2.7 … I now just need to find out what the root cause for this. There are some things to check here:

1. Tycho 3+ do not use gzip compression because usually files are already compressed and compressing a jar do not have much gain, still it might have a little influence but should not result in that much slow down given there are just about 200 files fetched.
2. Tycho 3+ creates a full cache, that is once you have downloaded all content you can go fully offline, of course this has some overhead but again given todays hard rive speeds I don’t expect much overhead here as well.
3. Tycho 3+ uses HtttpUrlconnection, it might be that we are hit by some system settings here that reduce e.c. keep alive handling. Again it is a bit strange that this should have such a large influence here.

So whats next is to take some measures here to get a better understanding whats going on.

@Phillipus Having an example is already great 😃

I’m just adding a note to all issues that are likely to “fall through” usual work of contributors, so if once someone stumble over it and feels it is a big concern for them can act upon it. We once fixed even an issue from Tycho 0.25 that way…