Traffic inspection software on routers also has a negative impact on performance. Network congestion reduces Office 365 performance. If traffic shaping is configured, make sure the internet speed for clients is enough to work in Office 365. Outlook Online initiates such connections for proper work. Office 365 establishes a high number of longer-lasting network connections.

Make sure your router and firewall don’t terminate long-term TCP connections if they are idle.

Make sure IP addresses, protocols, and file types needed to work in Office 365 are not blocked.

Check the configuration on your routers and firewalls.

Fixing internet connection issues affecting Office 365 performance These Office 365 issues are inconvenient when you want to open a document or write changes to it, and can considerably slow down operations. When using Office 365 online applications in a web browser and working with files in the cloud, a slow internet connection with high latency causes lags and delays. You need an internet connection with high bandwidth and low latency. The main requirement for using Office 365 is an internet connection. The reasons can be issues on a client’s computer (hardware and software), network or internet connection issues, and issues on Microsoft’s side (software updates, issues in a datacenter). There are multiple factors that can cause Office 365 slow performance. Read the white paper to learn how you can back up Office 365 data, what are the risks, and what shared responsibility is.

Data loss can cause even more financial and reputation loss for your organization compared to the low performance of a SharePoint site.

If you use Office 365, you should take care of data protection.

Microsoft onedrive sign in issues