Why Non-Filing CDN Access from Mainland China Is Often Slow: Return Routes, High-Defense Scrubbing, and a No-NS-Change Onboarding Solution

Many businesses choose non-filing CDNs to skip the lengthy ICP filing process, but after launch they often face evening peak lag for mainland users, origin servers overwhelmed by CC attacks, and huge bills from traffic-based billing being abused. This article analyzes from three dimensions—cross-border return routing, same-path DDoS/CC scrubbing, and smooth CNAME onboarding—how to build a non-filing acceleration defense line that balances mainland access speed and attack resistance.