Q: Does having a lot of Research Labs lag out the game?
A: It shouldnt, because there is no tick-based code that is executed

Q: Does reasearch-speed stack with multiple labs?
A: Yes research speed does stack just like in vanilla

Q: Is it worth researching Lab-research-speed?
A: Yes

Q: I need science-packs for another mod, how can i obtain science-packs?
A: Go to settings, global options and there is a option to reenable science-pack recipes