I want to Psionic Rush

[The Refused Stone]

What general order of tech do I need to rush it to receive it as soon as possible?

[Amanoob105]

Alien Biotech - Sectoid Autopsy - Psionics.
Personally I find the hard part to trying to get this going early is less the research, that bit's easy.
But trying to get the funds together and often feeling that I really need four (technically five, because power) other rooms to be built first. One of these days I need to just bite that bullet.

[Razorblade]

Tech isn't really the limiting factor; Elerium Crystals are. At least on Legendary, I've never found a way to get sufficient Elerium to research Psionics before the first Supply Raid.

As such, the main way to rush Psionics is build a Lab for extra research speed (this may not be particularly important on lower difficulties with shorter research times), and make sure you have sufficient supplies, energy, and an open spot to build the Psi Lab as soon as the tech is researched.

I'd also suggesting having extra supplies and energy to get the upgrade for the Psi Lab immediately, as well as a spare engineer for training.

Effectively, early Psi-Ops come at the cost of everything else: weapons, armor, squad size upgrades, and other (often more important) facilities need to be put on-hold. You pretty much need to be able to 4-man, no-upgrades the first half of the game to pull it off (at least on Legendary; it's been forever since I've played a lower difficulty).

[sick duck]

How many missions would you fail before the psionic rush gets good?