Some may find the linked Tech Spot article useful.
“How to Optimize Your Internet Connection for Gaming”
https://www.techspot.com/article/2157-optimize-gaming-internet-connection/
Ping & bandwidth: How fast is your internet?
- Use an Ethernet cable
- Reposition your router (Wi-Fi only)
- Use the right channel (Wi-Fi only)
- Enable Quality of Service (QoS)
- Turn off other devices and limit background applications
- Play in your region
- Enable MU-MIMO (Wi-Fi only)
- Change DNS servers and reboot your router
When all else fails… upgrade? More is available when you web search “improving your computer for gaming,” “improving your gaming experience,” and so forth.
Blizzard Tech Support Related Articles
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Optimizing Your Internet Connection - Blizzard Support (battle.net)
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Diablo III Performance Issues - Blizzard Support (battle.net)
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Unplayable latency issues across Blizzard games - Technical Support - Diablo 3 Forums
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Diablo III Locking and Crashing - Blizzard Support (battle.net)
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Diablo III Disconnection Problems - Blizzard Support (battle.net)
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Disconnected from Blizzard Services - Blizzard Support (battle.net)
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Connection to the Network Didn’t Respond in Time - Blizzard Support (battle.net)
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Resolving Internet Service Provider Connection Issues - Blizzard Support (battle.net)
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Power Cycling Your Network Devices - Blizzard Support (battle.net)
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Authenticator Error - Please Connect to a Network - Blizzard Support (battle.net)
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Troubleshooting Firewall Configuration Issues - Blizzard Support (battle.net)
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Diagnosing Network Issues with Looking-Glass - Blizzard Support (battle.net)