Sharepoint online site how does it work

Question

I know Sharepoint on premise site how it works in the back end like it goes to IIS server and request from IIS server sends to DNS which will identify IP and then IIS will check for SP server using that IP

But please explain clearly what happens in back end and how does Sharepoint online site work?

And one more question if Sharepoint online site is slow what we supposed to do.

What is the maximum site collection quota currently?

Please help . Thank you

Answer 1

@sns

1.Microsoft has many backend processor servers for SharePoint Online. With SharePoint Online, certain page requests may actually end up calling multiple servers. You could end up with a matrix of requests between servers for an individual request.

Reference:
Introduction to performance tuning for SharePoint Online

2.Here’re the top six reasons that your SharePoint environment is running slower than expected.
(1)Structural navigation.
(2)Content rollup.
(3)Large images or videos.
(4)Customization (Code).
(5)Too many requests.
(6)Too many web parts.
Reference:
https://www.entranceconsulting.com/sharepoint-online-is-slow-5-ways-to-improve-performance-issues/
You could follow below article to diagnose performance issues with SharePoint Online.
Diagnosing performance issues with SharePoint Online
Use the Page Diagnostics for SharePoint tool

3.
Reference:
SharePoint limits

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Answer 2

@sns

1. In the SharePoint Online, you can choose between two navigation methods: structural navigation or managed navigation when you've enabled the publishing feature on your classic SharePoint experience site. Structural navigation is based on site structure. Managed navigation is based on term sets.
   Reference:
   Enable managed navigation for a site in SharePoint
2. You can refer following articles to learn about SharePoint Online Authentication.
   SharePoint Online Authentication Options – Part 1
   SharePoint Online Authentication Options – Part 2
3. You could understand it as a requirement is divided into different small requirements, and then send those small requirements to backend processor servers.
4. If a user have higher permissions in a site collection but lower permissions in the tenant, the higher permissions are recognized in that site collection and the lower permissions are recognized in the tenant (admin center).
   If a user have lower permissions in a site collection but higher permissions in the tenant, the lower permissions are recognized in that site collection and the higher permissions are recognized in the tenant (admin center).
5. It's just a little difference in appearance.
   Classic experience
   
   Modern experience
   
6. In fact, the first thing that should be done is to delete unnecessary data and control the number of users who use site collection at the same time or distribute data to different site collections.

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