Here are the resources that would be helpful to understand the best practices for CDN’s in SharePoint Online and optimizing performance.
- SharePoint Performance Series – Office 365 CDN video series
https://www.youtube.com/playlist?list=PLR9nK3mnD-OWMfr1BA9mr5oCw2aJXw4WA - Content Delivery Networks (CDNs
https://docs.microsoft.com/en-us/office365/enterprise/content-delivery-networks - Use the Office 365 Content Delivery Network (CDN) with SharePoint Online
https://docs.microsoft.com/en-us/office365/enterprise/use-office-365-cdn-with-spo - Taking applications and content to the edge
https://myignite.techcommunity.microsoft.com/sessions/82944 - Overview of Microsoft Azure compliance
https://gallery.technet.microsoft.com/Overview-of-Azure-c1be3942 - Branding SharePoint: The New Normal
https://techcommunity.microsoft.com/t5/microsoft-sharepoint-blog/branding-sharepoint-the-new-normal/ba-p/241855 - Introduction to performance tuning for SharePoint Online
https://docs.microsoft.com/en-us/office365/enterprise/introduction-to-performance-tuning-for-sharepoint-online - Build your modern intranet on SharePoint in Office 365
https://resources.techcommunity.microsoft.com/resources/build-modern-intranet-on-sharepoint-office-365/ - Intrazone Podcast by Mark Kashman
https://intrazone.libsyn.com/