Xfinity Speed Test

Test Your Comcast Xfinity Internet Speed

Go beyond basic speed numbers. Measure your real Xfinity download speed, upload speed, ping, jitter, and bufferbloat to see how your connection truly performs.

Run Speed Test

About Comcast Xfinity

Technology

Cable (DOCSIS 3.1), Fiber (select areas)

Coverage

41 states

Typical Download

200-1200 Mbps

Typical Upload

5-35 Mbps

Xfinity Speed Tiers & Plans

PlanDownloadUploadPrice
Connect75 Mbps10 Mbps$35/mo
Connect More200 Mbps10 Mbps$55/mo
Fast400 Mbps10 Mbps$65/mo
Superfast800 Mbps15 Mbps$75/mo
Gigabit1000 Mbps20 Mbps$80/mo
Gigabit Extra1200 Mbps35 Mbps$95/mo

Prices and speeds are approximate and may vary by location. Promotional pricing may differ from regular rates.

Common Xfinity Issues

Bufferbloat during peak evening hours (7-11 PM)
Upload speeds significantly lower than download speeds
Latency spikes during network congestion
Speeds throttled after exceeding 1.2 TB data cap
Inconsistent Wi-Fi performance with rented gateway devices
Packet loss during heavy neighborhood usage

How Pong.com Helps Xfinity Customers

Most speed tests only measure raw throughput inside your ISP's network. Pong.com goes further, testing across the real public internet to reveal what your Xfinity connection can actually do.

Bufferbloat Detection

Discover if your Xfinity connection suffers from high latency under load. Bufferbloat causes lag and stuttering even on fast connections.

Jitter Analysis

Measure the consistency of your Xfinity connection. High jitter means unreliable performance for gaming, video calls, and streaming.

Connection Health Grade

Get an A-F grade for your Xfinity connection based on speed, latency, bufferbloat, and stability. Know exactly where you stand.

Real-World Experience Scores

See how your connection performs for specific activities: 4K streaming, video conferencing, competitive gaming, and web browsing.

Speed History Tracking

Track your Xfinity speeds over time. Spot trends, identify peak-hour slowdowns, and catch degradation before it becomes a problem.

Public Internet Testing

Unlike tests that measure inside Xfinity's network, Pong.com tests across the real internet, giving you speeds that match your actual experience.

Compare Xfinity to Alternatives

Verizon Fios

300-2300 Mbps down, 300-1000 Mbps up

Fiber (GPON / XGS-PON)

AT&T Internet / Fiber

300-5000 Mbps (Fiber), 10-100 Mbps (DSL) down, 300-5000 Mbps (Fiber), 1-20 Mbps (DSL) up

Fiber (AT&T Fiber), DSL (legacy IPBB)

Spectrum (Charter)

300-1000 Mbps down, 10-35 Mbps up

Cable (DOCSIS 3.1), Fiber (expanding)

T-Mobile 5G Home Internet

50-300 Mbps down, 5-30 Mbps up

5G (n41, n71), 4G LTE (fallback)

Google Fiber

1000-8000 Mbps down, 1000-8000 Mbps up

Fiber (GPON / XGS-PON)

Xfinity FAQ

Is Xfinity throttling my internet?
If your speed test results are significantly lower than what your Xfinity plan advertises, throttling or network congestion could be the cause. Run a test on Pong.com to check your real speeds. Pong.com tests through the public internet (not inside Xfinity's own network) so you get an accurate picture. Try testing at different times of day to see if speeds drop during peak hours.
What speeds should I expect from Xfinity?
Xfinity offers download speeds of 200-1200 Mbps and upload speeds of 5-35 Mbps, depending on your plan and connection type (Cable (DOCSIS 3.1), Fiber (select areas)). On a wired Ethernet connection, you should typically see 70-90% of your plan's advertised speed. Wi-Fi speeds will be lower due to signal attenuation and interference. Use Pong.com to verify your actual speeds.
Why is my Xfinity internet slow even with a fast plan?
Several factors can slow down your Xfinity connection: bufferbloat (high latency under load), Wi-Fi interference from neighboring networks, outdated modem or router firmware, network congestion during peak hours, or issues with your home wiring. Pong.com tests all of these factors in a single test, including bufferbloat detection, jitter analysis, and a connection health grade.
Does Xfinity have bufferbloat problems?
Bufferbloat can occur on any ISP connection, but it is especially common on Cable (DOCSIS 3.1) connections. It causes your latency to spike when your connection is under load (e.g., downloading a file while on a video call). Pong.com specifically tests for bufferbloat and grades it from A (excellent) to F (severe). This tells you more about your real connection quality than download speed alone.

Ready to Test Your Xfinity Connection?

Get the full picture: download, upload, ping, jitter, bufferbloat, and a connection health grade.

Run Speed Test Now