Optimum speed test

Optimum's cable tiers commonly run 300 Mbps, 500 Mbps and 1 Gig download, with uploads typically 20–50 Mbps on cable. Optimum Fiber tiers are symmetrical, from 300 Mbps to 8 Gbps in some areas. Cable download at 85–100% of plan on a wired test is normal; some areas read slightly above plan because of built-in overprovisioning.

Cable networks give far more capacity to download than upload, so 20–35 Mbps upload on a gigabit cable plan is typical and not a fault. If you upload large files or run several video calls at once, that's the figure that matters. Optimum Fiber, where available, removes the asymmetry entirely.

Look at ping under load and the bufferbloat grade. Cable upload saturates easily — one person backing up photos can push ping from 15 ms to 300 ms for everyone. A D or F grade means the gateway isn't managing its queue; a router with SQM set to about 90% of your measured upload speed fixes it.

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