Tried the following steps :
[15:30:00] Max Rydahl Andersen: cmd+4 new project
[15:30:05] Max Rydahl Andersen: cmd+4 jpa entity
[15:30:07] Max Rydahl Andersen: add some code
[15:30:16] Max Rydahl Andersen: getter/setter for a name for example
[15:30:22] Max Rydahl Andersen: cmd+4 scaffold /angular js

Each step took a really fair amount of time. Freezing eclipse at some point.
jstack tells me there's actually a large number (68) of weld threads running. See https://gist.github.com/fbricon/c3038d1e1438d808ee93

This seems unreasonable