Huge lag spikes and long loading time

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huge lag spikes and major waiting time on loading screan

2

This is not enough information to assist you or pinpoint a problem. Which server? What zone? What time did this happen? Have you tried any network tests to see if the issue is on the ISP network?

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https://us.forums.blizzard.com/en/wow/t/using-winmtr-to-troubleshoot-lag-issues-inside-sl-dungeonsraids/868417