Upgreade to 3.42, and experience big perforence drop.

Usually, when you download some site, you can setup download connection to
larger number like 16 or 32, then you will see a lot of parallel download.

However, now it does to no more than 4, even though it's same project file and
same setting.

Is this related to the major underline library fix?
The impact is as much as 6X time difference.