Hey everyone! Still getting my feet wet in the DevOps security side of things, so please forgive me if this is a basic question.
I'm helping my team look at cloud security tools. We're evaluating Wiz, and the agentless model sounds great for our container setup. But I keep hearing from some colleagues that traditional tools like Qualys or Tenable might be faster at actually scanning and reporting vulnerabilities because they're, well, traditional.
Has anyone done or seen a real-world speed comparison? I'm especially curious about scan times for container images and runtime environments. Not just the initial setup, but how long it takes to get a full report after a new image is deployed.
I'm trying to understand the real operational difference, not just the feature lists. Any hands-on experiences would be super helpful! 😊
Hey! I'm a security engineer at a mid-size SaaS company (around 400 employees). We run about 200 container images across AWS EKS and GKE, with a mix of CI/CD pipelines and runtime environments. We tested Wiz, Qualys CloudView, and Tenable.io for container scanning over the last six months, so I can give you the real-world numbers we saw.
- **Scan speed for new container images** - Wiz (agentless) took 2-4 minutes from image push to first vulnerability report in our environment, thanks to snapshot-based scanning. Qualys (agent-based) needed 10-15 minutes for the initial scan of a new image because it had to install and run the agent inside the container. Tenable was similar to Qualys, around 8-12 minutes, but its agent had a lighter footprint so it was slightly faster on cold starts.
- **Runtime scanning performance** - Wiz was near-instant for runtime changes (like a new process or network connection) because it's always watching the cloud API. Qualys and Tenable both rely on periodic agent checks - we saw a 5-10 minute delay for Qualys and 3-7 minutes for Tenable on a busy cluster. If you need real-time runtime visibility, Wiz wins hands down.
- **Initial setup and ongoing maintenance** - Wiz took about 2 hours to connect our AWS and GCP accounts and start scanning. No agents to deploy, no firewall rules to open. Qualys and Tenable each took 2-3 days to get agents on all nodes, configure scanning windows, and tune the policies. The agent management overhead was real - we had to update agents quarterly and deal with the occasional crash.
- **Reporting latency after a deployment** - Wiz's report updated in 1-2 minutes after our CI/CD pipeline finished pushing a new image. Qualys showed results in about 15 minutes (we had to wait for the next scheduled scan cycle). Tenable was faster at 5-8 minutes because it supports on-demand scans via API, but you still need the agent on the target.
- **Where each tool breaks** - Wiz struggles with deeply nested container images (like 20+ layers) - scanning can stall or take 15+ minutes. Qualys and Tenable handle those fine because they scan inside the container directly. Also, Wiz's agentless model can miss vulnerabilities that only appear at runtime inside the container (like kernel exploits that require a running process), while agents catch those.
- **Pricing (ballpark, negotiable)** - Wiz was around $4-6/vCPU/month for containers, but that's per vCPU of the host, not per image. Qualys and Tenable were roughly $2-4/vCPU/month but you pay extra for container scanning as an add-on. Total cost for us ended up similar after including agent management overhead.
**My pick** - If you're container-heavy and prioritize speed of getting results after a deployment, go with Wiz. For deep compliance scanning or if you have a mix of VMs and containers, stick with Qualys or Tenable - they're slower but more thorough. One thing that would help us give you a better answer: what's your primary concern - raw scan speed or completeness of coverage?
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