Bufferbloat
Fast connection but still lagging? Bufferbloat is the invisible network killer that slows down real-time applications.
What Is Bufferbloat?
Oversized Buffers
Routers and modems have buffers that temporarily store data packets. When these buffers are too large, packets queue up. Instead of being dropped and retransmitted, they wait in line.
Packets in the Queue
Under load, buffers fill up. Every new packet must wait until the old ones are processed. The result: latency rises from milliseconds to seconds.
High Latency and Jitter
The result is noticeable: lag in gaming, dropouts in video calls, stuttering streams. All despite a connection that should be fast enough.
Who Is Affected by Bufferbloat?
Real-Time Transmissions
Gaming and video calls have one thing in common: milliseconds matter. Lag spikes ruin the game, and in calls you see and hear responses with delay, while others experience delays because of you. As soon as someone on the network starts a download in parallel, ping times explode.
Businesses
VOIP quality, cloud services and remote desktop: all real-time applications that suffer massively from bufferbloat.
Everyone with Concurrent Usage
As soon as upload and download run simultaneously, bufferbloat becomes noticeable. This affects virtually every modern household and office.
How to Detect Bufferbloat?
- •A normal speed test shows high bandwidth, but latency under load tells the real story. Only when the network is simultaneously stressed does bufferbloat reveal itself.
- •The Waveform Bufferbloat Test (speed.cloudflare.com) measures latency under load and provides a clear rating. Typical for bufferbloat: High bandwidth, but latency increases 10–100x under load.
- •Typical symptoms: Internet feels slow even though the speed test shows good values. Lag spikes come and go. Video calls only break up when other things are running in parallel.
How to Control Bufferbloat?
SQM (Smart Queue Management)
SQM intelligently limits buffers and distributes bandwidth fairly. Real-time packets (gaming, calls) get priority, large downloads are throttled, all automatically.
fq_codel & CAKE
Modern queue algorithms like fq_codel and CAKE solve bufferbloat at the kernel level. They keep buffers small and latencies low, even under full load.
Professional Routers with QoS
Routers from MikroTik and other manufacturers offer granular queue management. This allows bufferbloat to be completely eliminated.
Why the Fritzbox Doesn't Help Here
The Fritzbox has no real SQM or queue management. Its buffers are too large and not configurable. This makes it unsuitable as the main router for latency-sensitive applications. More about the Fritzbox
The Result
- •Stable latencies even under full load, regardless of whether someone starts a large download in parallel.
- •Gaming, 4K streaming and video calls simultaneously, without mutual interference.
- •Performant enough over WiFi for real-time applications. It's not about the wireless technology, it's about the queue management behind it.
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