Bufferbloat & Network Latency Tester – Loaded Latency & Gaming Ping Jitter
What is Bufferbloat and Why Does It Cause Lag?
Bufferbloat is the undesirable latency that comes from routers and modems buffering excessive packets when your internet connection is heavily loaded (such as during large game downloads or 4K video streaming). While large packet buffers prevent dropped packets, they trap time-sensitive packets (such as voice communications or online multiplayer position updates) in massive queues, skyrocketing your ping from 20ms to 300ms+.
How This Test Works
- Phase 1 – Unloaded Latency: Measures your baseline ping to global edge Anycast nodes when the connection is idle.
- Phase 2 – Bandwidth Saturation: Saturates your download pipe with high-concurrency parallel streams.
- Phase 3 – Loaded Latency: Measures real-time round-trip latency under full load to calculate the exact bufferbloat delta.
How to Eliminate Bufferbloat
To fix a low grade (C, D, or F), enable Smart Queue Management (SQM) in your router settings (such as CAKE or FQ-CoDel algorithms), or set up bandwidth rate limiting to prevent link saturation.
Frequently asked questions
What is a good Bufferbloat Grade?
An A or A+ grade indicates your router manages buffers effectively, adding less than 15ms of delay under full saturation. Online gaming and Zoom calls will remain butter-smooth.
How does SQM (Smart Queue Management) fix bufferbloat?
SQM limits buffer queue sizes and prioritizes low-latency interactive packets ahead of bulk downloads, ensuring gaming ping never spikes.
Does this test consume a lot of data?
No. The saturation burst lasts only a few seconds, consuming approximately 15–25 MB of data.
Eliminate bufferbloat lag spikes and prioritize gaming traffic with advanced SQM hardware.