Crawford is a lot of fun to play!Ahh. Tbh I tr d to mainly play as the guy that can deploy the big mini gun. I notice the performance has got better, but still not on par with previous games imo.
It's definitely worth having a few different specialists in your locker so you know how they play and can swap to them depending on the circumstances of the game.
Rao is definitely worth playing if there's lots of vehicle control by the other team. Falck is the best from the medic / support options, Angel is a bit useless now they've removed his ability to apply armour to himself or others on revives and Crawford is fun, but I find Falck's med pen more useful than Crawford's mini gun.
Mackay is always worth playing because grappling hooks in games = fun.
Irish is great for Breakthrough because of his trophy system, you basically mitigate the grenade spam, and you make Sundance's grenades completely useless.
Performance for me is fine on 64p modes, it's the 128p ones where I notice it struggles more - although I'm still comfortably above 100fps with aa 3070 and 5800x at 1440p. On the 64p modes it's more regularly in the 120-140 region.