2.4 Comparative Latency Studies Across Darknets

Latency — the delay between sending and receiving data — is one of the most defining characteristics of any anonymity network.
Every darknet (Tor, I2P, Freenet, GNUnet, Yggdrasil, Nym) is designed for a different privacy model, and therefore, latency is not a “bug” but a design decision.

This chapter examines how architectural choices affect latency, bandwidth, routing delay, and real-world responsiveness.

A. Why Latency Matters in Darknets

Latency affects:

user experience
bandwidth usage
reliability of connections
feasibility of real-time applications
anonymity strength

In anonymity systems, lower latency usually means weaker anonymity, while higher latency often correlates with stronger anonymity (especially against global adversaries).

This is known as the latency–anonymity tradeoff.

B. Low-Latency vs High-Latency Anonymous Networks

Type	Purpose	Examples	Average Latency
Low-Latency Networks	Real-time usage	Tor, Lokinet, Yggdrasil	50 ms – 600 ms
Medium-Latency Networks	Peer-to-peer, internal darknet	I2P, GNUnet	200 ms – several seconds
High-Latency Networks	Strong metadata resistance	Nym, Loopix, mixnets	Several seconds to minutes

No darknet is optimized for all three: speed, security, and anonymity.

C. Latency Factors Across Darknets

Latency differences are caused by:

Routing architecture (onion, garlic, DHT, mixnet)
Number of hops in each request
Cryptographic operations required per message
Node selection and trust model
Network congestion
Geographical distribution of nodes
Design priorities (speed vs anonymity vs decentralization)

Let’s analyze each network individually.

D. Tor Latency Characteristics (Low-Latency Onion Routing)

Tor uses three-hop circuits with layered encryption.

Latency Profile

Typical: 100–600 ms
Higher under congestion
Lower than I2P due to centralized directory authorities enabling optimized routing

Reasons for Moderate Latency

Relays are volunteer-based and unpredictable in performance.
Multiple encryption layers add processing time.
Circuits rotate every ~10 minutes, adding overhead.
Path length fixed at 3 hops, balancing anonymity and latency.

Real-World Findings

Empirical studies show Tor is suitable for:

browsing
messaging
moderate-speed downloads

Not ideal for:

VoIP
video streaming
high-throughput applications

Reference: Johnson et al., 2013; Dingledine et al., 2004.

E. I2P Latency Characteristics (Unidirectional Tunnels + Garlic Routing)

I2P routes data through separate inbound and outbound tunnels, increasing routing complexity.

Latency Profile

Typically: 150 ms – several seconds
Higher than Tor in many experiments
Highly dependent on tunnel length and peer performance

Reasons for Higher Latency

Two independent tunnels increase overhead.
DHT-based router selection introduces randomness.
Garlic routing bundles multiple messages, adding processing time.
Internal peer-to-peer design prioritizes anonymity over speed.

I2P is optimized for:

internal darknet websites
P2P file sharing
anonymous chat

Reference: Zantout & Haraty, 2011; I2P Technical Documentation.

F. Freenet Latency Characteristics (Distributed Data Store)

Freenet is not designed for interactive browsing.
It is effectively a distributed cache retrieval system with probabilistic routing.

Latency Profile

Can range from several seconds to several minutes
Depends heavily on:
- network size
- content popularity
- data replication proximity

Reasons for High Latency

No direct path to content — routing is probabilistic.
Data is split into encrypted chunks across the network.
Requests may traverse many hops before completion.

Ideal for:

censorship-resistant publishing
long-term archival storage

Not designed for real-time use.

Reference: Clarke et al., 2000.

G. GNUnet Latency Characteristics (Peer Group Cryptography & Transport Plugins)

GNUnet’s routing protocols vary depending on which subsystem is used.

Latency Profile

Medium to high latency
Varies greatly with transport plugin (TCP, UDP, Bluetooth)

Reasons

Heavy cryptographic authentication between peer groups.
Flexible routing layers introduce additional overhead.
Emphasis on distributed trust over speed.

GNUnet is optimized for:

censorship-resistant naming (GNS)
distributed identity
private group communications

Reference: Grothoff, 2017; GNUnet Architecture Documentation.

H. Yggdrasil Latency Characteristics (Encrypted IPv6 Mesh)

Yggdrasil provides encrypted routing but not anonymity.
It aims for fast, stable global mesh networking.

Latency Profile

Low latency: 20–100 ms depending on proximity
Comparable to VPN tunneling
Faster than Tor and I2P in most cases

Reasons

Efficient DHT-based routing.
Minimal cryptographic overhead compared to onion routing.
Emphasis on secure connectivity, not anonymity.

Ideal for:

decentralized applications
peer mesh networking

Reference: Yggdrasil Whitepaper.

I. Nym Latency Characteristics (High-Latency Mixnet)

Nym is designed for maximum metadata resistance, not speed.

Latency Profile

Several seconds to minutes
Controlled delays intentionally disrupt timing correlations

Why High Latency?

Mixnets deliberately add:

batching
shuffling
timing obfuscation
multi-hop message mixing

Ideal for:

whistleblowing
private messaging
metadata-resistant communication

Not suitable for:

web browsing
real-time activities

Reference: Kwon et al., 2017 (Loopix design); Nym Whitepaper.

J. Latency Comparison Table (Summary)

Network	Latency Level	Routing Type	Notes
Yggdrasil	Low	DHT Mesh	Fastest, not anonymity-focused
Lokinet	Low to Medium	LLARP	Designed for real-time anonymous apps
Tor	Medium	Onion Routing	Balanced anonymity vs speed
I2P	Medium to High	Garlic Routing	Higher latency due to dual tunnels
GNUnet	Medium to High	Peer-group routing	Flexible but heavy cryptography
Freenet	High	Key-based data retrieval	Storage system, not real-time
Nym	Very High	Mixnet	Strongest metadata protection

K. Why Latency Differences Matter

Each network optimizes for a different goal:

Speed: Yggdrasil, Lokinet
Balanced anonymity: Tor
Decentralized anonymity: I2P
Storage-based censorship resistance: Freenet
Trust-based anonymity: GNUnet
Metadata resistance: Nym

Latency is therefore a direct reflection of a network’s threat model and design philosophy, not a defect.