I noticed that too - suddenly took a nose dive - Came on here to see if anyone else had noticed it.

Always good to know its not just you..

In our portal under Service Health:

Updates
27 Jun 2024, 1:58 pm NZST
We're investigating reports indicating that users are unable to access multiple Microsoft 365 services. We're examining our service telemetry so we can identify the source of the issue and determine next troubleshooting steps.

Yep, issues here too. Admin portals slow and timing out, OneDrive incredibly slow. We've also got a few clients who have secondary MX (absolutely not something we've implemented) and emails are ending up at that second MX instead of O365 which is strange.

Yup 

Users may experience issues accessing multiple Microsoft 365 services

ID: MO805755
Issue type: Incident

Status
Service Degradation

Impacted services
Microsoft 365 suite

Details
Title: Users may experience issues accessing multiple Microsoft 365 services

User impact: Users may experience issues accessing multiple Microsoft 365 services.

More info: Affected services include, but may not be limited to:

- SharePoint Online
- OneDrive for Business
- Microsoft Teams
- Exchange Online
- Exchange admin center
- Microsoft 365 admin center
- Microsoft Intune

Current status: We're reviewing impact details provided by affected users and analyzing recent service changes so we can isolate the source of the issue.

Scope of impact: Users attempting to access multiple Microsoft 365 services may be affected by this event.

Next update by: Thursday, June 27, 2024, at 3:00 AM UTC

Long email delays, and I'm trying to setup some transport rules in Exchange and it throws out random errors referencing other unrelated rules. It's a bit of a mess.

I noticed that to just making some changes before! Very slow and time outs

Paul1977:

 

Long email delays, and I'm trying to setup some transport rules in Exchange and it throws out random errors referencing other unrelated rules. It's a bit of a mess.

 

Error message turned out to be unrelated!

So that is why OneDrive was so painfully slow today.