I haven't seen people seriously discussing stimulants (such as Adderall and modafinil) as performance enhancers; I've come across a number of people using these, but all in the context of diagnosed ADHD. I've also not seen anyone experimenting with microdosing LSD.
There's a surprising amount of openness and support for talking about mental health issues in general. I think this is a really good thing. The stigmatization we see in broader society is not actually helpful.
Obviously this is all my personal observation, but I think I would know; I definitely saw some serious drug use when I was in grad school at Berkeley.