Onboarding Friction for PSPs – What's Acceptable Now?

I've been working on integrating a new payment gateway for our cross-border e-commerce operations, specifically looking at options that offer good coverage for emerging markets. The technical integration side is largely standardized these days, but I'm consistently hitting a wall with the onboarding and KYB process. It feels like every PSP has its own unique flavour of document requests, and the timelines for verification are wildly inconsistent. We're talking about anything from a few days to several weeks, even for a relatively clean corporate structure.

This variability is a real headache when trying to plan rollouts and manage cash flow, especially for new products or market entries where speed is crucial. I understand the regulatory burden is significant, and I appreciate thorough due diligence, but the lack of standardization or even predictable timelines across providers is a genuine operational bottleneck. What's everyone else seeing out there? Are there specific types of PSPs or jurisdictions where this process is noticeably smoother, or conversely, particularly painful? Curious to hear if others have found ways to streamline their end of this process to mitigate the delays.