If you’ve heard complains about D365 running poorly throughout on a particular day, not necessary the issue could be with D365. It could be network latency.
And one of the first thoughts would be “To try on a different browser” without much investigation on it.
In fact, it could be bandwidth or latency issue. You’ll need Dynamics 365 Diagnostics here.
Check Latency
- You need to login to your browser session with your D365 credentials
- Enter this URL in a new tab https://<ORGNAME>.crm.dynamics.com/tools/diagnostics/diag.aspx
- It will show you a Dynamics D365 Diagnostics page like this
- When you click on Run, it takes a few seconds to perform the test before showing you the results
Hope this helps!
D365 Demystified 
[…] Run Dynamics 365 Diagnostics to check network latency […]
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Is this Microsoft tool still working?
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Yes it is still operational. I just checked and it worked. Where I mention crm.dynamics.com, you’ll need to put your Org’s URL in place of ‘CRM’.
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