Have you tried the DSLReports Speedtest? I've found it very helpful in diagnosing latent but not obvious network issues: https://www.dslreports.com/speedtest ht

Have you tried the DSLReports Speedtest? I've found it very helpful in diagnosing latent but not obvious network issues: https://www.dslreports.com/speedtest https://www.dslreports.com/speedtest