Onboarding Speed & KYC/AML Load for Institutional Accounts

Curious to hear about others' experiences lately regarding the onboarding timeline and the sheer volume of KYC/AML documentation requested when setting up new institutional accounts, particularly for anything involving significant liquidity like prime brokerage or dedicated payment channels. It feels like the goalposts are constantly shifting, with a new requirement surfacing just as you think you're clear. We recently went through a process with a new PSP that took over six weeks, largely due to back-and-forth on source of funds for corporate capital. Any strategies people have found effective in streamlining this, especially with counterparties that aren't inherently tech-forward?