Why is my CenturyLink / Quantum Fiber Internet slow?

Find out what's wrong with yours

Slow Internet usually comes from Wi-Fi, a connection that bogs down when it's busy, or the provider's network, and each has a different fix. Our free test works out which one you have.

Test my connection

About a minute, no account.

What tests from CenturyLink / Quantum Fiber customers show

We don't have enough tests from CenturyLink / Quantum Fiber customers yet to show numbers. We wait for at least 30, so no one's results stand out. Your test adds to the anonymous totals.

Common causes

Wi-Fi is the most common cause of slow Internet at home, whatever the provider. See why your Wi-Fi is slow.
A connection that bogs down when it's busy (bufferbloat): browsing, games and calls slow down whenever someone streams or downloads. See slow Internet with a fast speed test.
Peak-time congestion on the provider's network, usually in the evening. See why Internet slows down at night.
Equipment or line problems: an old or overheating modem or router, or a fault on the line.

What to try

Run our test to see which of these you have.
Restart your modem (or gateway) and router: unplug for 30 seconds, then plug the modem in first.
Test with a device plugged in by Ethernet. If that's fast, the problem is your Wi-Fi, not CenturyLink / Quantum Fiber.
If it's slow even when wired, test a few times at different hours, then contact CenturyLink / Quantum Fiber with the report our test creates.