Ah yes, the action economy.
Laughs in Spell + Hasted Spell + Quickened Spell + item that give you an extra Bonus Action spell (or the BA cantrip "Shove") + Action Surged Spell + Fast Hands Bonus Action (quickened spell, obviously) + probably another item(set) that makes spells more powerful and/or gives you another action to cast a spell.
Did Larian take out the "That action can be used only to take the Attack (one weapon attack only), Dash, Disengage, Hide, or Use an Object action" from Haste and even stricter limitation from Fast Hands? As for Bonus Action Spells, you should be able to cast them faster. For 2 Fireballs, you need Sorcerer 5, Quicken Spell, and you consume 2 of 5 Sorcery Points and both 3rd Level Spell Slots. For 3 Fireballs, you need Fighter 2/Sorcerer 6, Quicken Spell, and you consume Action Surge, 2 of 5 Sorcery Points, and all 3 3rd Level Spell Slots. It's very valuable, maybe OP, but it consumes resources. Anyway, Fighter 2/Sorcerer n isn't on the list of most OP multiclasses.
