At boid demo, it seems like the performance of 0.2 package perform badly compare with previous version. Which part make it so slow?
Better check the profiler and compare but your open Entity Debugger window is probably a big reason.
you should compare the results in built version as there could be all kinds of things going on in the editor.
that being said, I tried to package that yesterday and failed at it 
make sure the running jobs are bursted. I’ve seen some people having the same issue, as workaround they closed the unity editor, removed the library folder and then reopen unity again.
this should fix the problem.
Also, before to try the workaround above, try to recreate the subscene.
you can’t mistake burst being disabled on that sample, it runs like few frames a second even on high end cpu’s without burst.