Hi everyone. I've been lurking for a bit but this is my first real post, so apologies if this is a basic question.
My company recently made the switch from Cisco Firepower (we were on the 2100 series) to a Palo Alto PA-3400 series. The main reason for the switch was management headaches with Firepower, but I'm now trying to understand the performance side of things.
Our vendor's datasheet promises a lot more throughput for the Palo Alto box. But in my (admittedly limited) experience, datasheet numbers always seem to live in a perfect world. With Firepower, we never really felt like we hit the promised throughput once we turned on all the inspection services.
For those of you who have made a similar move, what was your real-world experience? Did you actually see a noticeable difference in usable throughput with similar security policies enabled? I'm especially curious about SSL decryption scenarios, as that really seemed to slow things down on our old setup.
I'm just trying to set my own expectations and maybe learn what to look out for. The new interface is a lot to take in, but I'm hoping the performance is more straightforward.
Hey, welcome to the community. I'm a systems architect for a mid-sized financial services firm (around 1500 users), and we've managed both Firepower 4100s and Palo Alto 5200/3400 series in production over the last five years, handling everything from branch offices to our primary data center edge.
Having managed both stacks, the real-world throughput difference hinges less on the headline number and more on how the platforms handle inspection under load. Here's a breakdown from our migration:
* **SSL Inspection Overhead**: This is the big one. On our Firepower 2110s, enabling full SSL decryption could cut the advertised threat throughput by 60-70%. Our PA-3400 series holds much closer to its spec; we see about a 30-35% drop. The PAN-OS single-pass architecture really shows here. For us, that meant the PA-3400 handled our 1 Gbps decrypted requirement where the Firepower 2110 consistently struggled past 650 Mbps.
* **Management Resource Drain**: With Firepower, the FMC and device management traffic itself seemed to create variability. A complex policy push could sometimes spike CPU and impact forwarding. The Palo Alto Panorama management is far more predictable in our experience; policy pushes are less intrusive to data plane performance. We don't see those transient throughput dips.
* **App-ID vs. Port-Based Defaults**: Out of the box, Palo Alto's App-ID gives you more precise control but requires a mindset shift. A permissive "allow any" rule on Firepower might not hit the CPU hard, but the equivalent "allow all applications" rule on a Palo Alto policy can become a performance sink if you don't refine it. Throughput stays high when you use specific App-ID and Security Profile groups.
* **Subscription Impact**: Both slow down with all subscriptions on, but the delta is different. For a typical enterprise policy (AV, IPS, URL Filtering, Threat), our Firepower boxes operated at about 40-50% of their base "firewall" throughput number. The comparable Palo Alto "threat prevention" throughput spec was a much more reliable benchmark; we get about 80-85% of that number in daily operation.
Given that your main gripe was management headaches and you're focused on throughput with services enabled, I'd recommend the Palo Alto for your scenario. The performance is more predictable and the management overhead is lower, which matches your pain points. If you were in a very static, port-based environment with a tiny team, I might lean Cisco, but for modern inspection at consistent speeds, Palo Alto is the clearer choice. To be absolutely sure, what's your target decrypted throughput and how many unique applications do you need to identify in your policies?
Architect first, buy later
That SSL overhead difference lines up with what I've seen in cost models. The performance drop isn't just a speed bump, it translates directly into needing a bigger box, or more of them, to handle the same traffic.
We had to size for the worst-case throughput, and with Firepower that meant paying for specs we'd never reach under full inspection. The Palo Alto box, while pricier upfront, actually delivered closer to its rated throughput so we didn't have that same 30-40% overprovisioning buffer built into the quote.
It's the classic spec-sheet vs. real-world tax. The firewall budget that disappeared into the performance overhead was always a fun line item to explain.
Cloud costs are not destiny.