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Firewall Strain Explained – And How DFence Reduces It by 50 Percent

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If your organisation operates with high data volumes, multiple sites, cloud workloads, IoT devices, or sensitive information, the firewall is one of the most heavily used components in your security stack. But in 2025, most enterprise firewalls are silently struggling under extreme load. This leads to slower networks, higher security risk, and escalating operational cost.

Understanding what causes firewall strain — and how DFence reduces it by up to 50 percent — can reshape how large organisations protect their infrastructure efficiently.

Why Modern Firewalls Are Under Strain

1. Enterprise Traffic Growth

Recent network studies show that a majority of enterprise data now moves across networks daily. Many organisations now process more than 80 percent of their data across internal and external networks.

This means firewalls today must inspect more traffic than ever, while dealing with:

cloud applications
remote connections
microservices
interconnected operational systems
machine-to-machine telemetry

2. Encrypted Traffic Overload

Over 95 percent of web traffic is now encrypted, making inspection significantly more resource-intensive.

Furthermore, more than 85 percent of cyber attacks now use encrypted channels such as HTTPS or TLS.

This puts an enormous burden on firewalls that must either decrypt traffic or rely on behavioural heuristics under high load.

3. Increased Bot and Automated Activity

Bot-driven requests, API calls, and automated system traffic continue to rise annually. Even when legitimate, such high-frequency “background noise” forces the firewall to expend processing cycles that could be used for genuine threat inspection.

4. IoT and Multi-Service Environments

Industries such as hospitality, logistics, biomedical labs, property management, and carpark operations run many connected devices:

sensors
access-control systems
facility automation
vehicle tracking
point-of-sale terminals

Each device adds traffic sessions that the firewall must authenticate and inspect.

5. Logging and SIEM Burden

Firewalls generate some of the largest log volumes within enterprise environments. Higher load = higher log generation = higher SIEM cost.

This is why many enterprises begin to notice:

slower application response times
higher latency
firewall CPU saturation
larger SIEM bills
reduced inspection accuracy
increased blind spots

Firewall strain is not simply a technical inconvenience. It is a security, operational and financial risk.

How DFence Reduces Firewall Strain by 50 Percent

DFence works as a threat-intelligence router that sits in front of your firewall. Instead of your firewall receiving full raw traffic volume, DFence first filters, classifies, and blocks threats based on real-time intelligence.

Here is how DFence achieves up to 50 percent load reduction:

1. Pre-Filtering of Malicious Traffic

Many threats — IPs, domains, bot networks — are already known in global threat feeds. DFence blocks these at the source before they reach the firewall.

This immediately removes a large portion of junk and malicious packets that would otherwise consume firewall resources.

Impact on strain reduction:
Up to 20 to 30 percent of incoming external traffic can be eliminated through proactive IP and domain filtering.

2. Noise Reduction for Automated and Low-Value Traffic

Enterprises see high volumes of:

machine telemetry
software update checks
IoT chatter
repetitive API heartbeats

These are not threats, but they consume significant firewall processing.

DFence identifies such low-risk patterns and handles them intelligently without forcing the firewall to inspect every packet.

Impact on strain reduction:
Depending on environment type, 10 to 15 percent of traffic is low-value noise.

3. Filtering Suspicious Encrypted Traffic Before Firewall Decryption

Since more than 95 percent of traffic is encrypted, firewalls often struggle with decryption demands.

DFence performs intelligent pre-analysis of encrypted traffic using metadata, known-bad behaviour patterns, and real-time intelligence before traffic reaches the firewall.

This dramatically reduces the amount of traffic requiring expensive deep-packet inspection.

Impact on strain reduction:
Encrypted pre-analysis can reduce inspection workload by 10 percent or more.

4. Lowering SIEM and Log Volume

By filtering noise and malicious sessions earlier, DFence cuts down the volume of logs created by the firewall.

This offers two benefits:

less SIEM overhead
faster investigation
lower cloud logging cost

Impact on strain reduction:
A measurable 5 to 10 percent reduction in syslog output is common.

Combined Result: Up to 50 Percent Firewall Load Reduction

When combined, DFence typically reduces firewall workload by:

20–30% through malicious and bad-domain filtering
10–15% through low-value traffic reduction
10%+ through encrypted traffic pre-analysis
5–10% through log traffic reduction

These improvements add up to as much as 50 percent reduction in firewall strain, depending on traffic type and organisational profile.

This allows organisations to:

delay or avoid costly firewall upgrades
improve detection accuracy
reduce downtime risk
improve network performance for business applications
reduce SIEM and logging cost
maintain operational continuity even at peak traffic load

What This Means for Large Enterprises

If you operate in sectors such as hospitality, logistics, biomedical research, property development, carpark management, M&E or tech-driven services, you are likely processing millions of data sessions daily. Firewall strain is already impacting your:

user experience
application performance
security visibility
operational cost

DFence gives you a scalable, modern architecture that handles today’s high-volume traffic environment without overburdening your firewall.

It protects your business continuity while keeping your security posture strong. Contact us to learn more on how F12 Data can help you with firewall strain.

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