Comment by bayindirh

Eclipse already does non-critical background tasks on separate threads, and non-critical startup tasks are done in "deferred early start" queue, which is emptied after initial startup.

Normally Eclipse IDE is not something like Vim, which you enter and exit 10 times a day. It just lives there and you work with it. 10 seconds in the morning for a tool that big is very acceptable, esp. after considering that everything is instantaneous after that 10 seconds.