Both names predate the modern CDN marketing era, and both descend from the same ancestral resource: serious bandwidth, owned and operated. What each built on top of it diverged instructively.
Lineage shapes product
Leaseweb is one of Europe’s infrastructure giants, dedicated servers, colocation, cloud, whose CDN exists to accelerate and offload customers already inside its network empire: pragmatic, integrated, priced like the utility it is. CacheFly is the specialist that famously bet on TCP anycast before it was fashionable, building a reputation for throughput consistency and latency stability that podcast and software-delivery giants quietly relied on for two decades.
Technical posture today
CacheFly’s pitch remains performance-first: anycast routing, throughput SLAs it is willing to write down, and a network tuned for sustained transfer rather than feature sprawl. Leaseweb’s CDN covers modern essentials with the deeper value hiding in adjacency: origins on Leaseweb metal enjoy short, cheap paths to the edge, and one vendor relationship covers the stack.
A historical note with practical teeth: TCP-anycast delivery, once considered exotic and fragile, is now mainstream architecture across the industry, which quietly vindicates CacheFly’s early bet and removes the old objection to it. The remaining differentiation is execution: route stability under network churn, session persistence behavior for long transfers, and how each network handles the peering incidents that anycast inherits from the internet’s politics. These are precisely the properties a two-week trial with real transfers exposes and no datasheet ever will.
Where each fits
Origin-heavy estates already on Leaseweb infrastructure get a low-friction accelerant with unified billing. Delivery-critical workloads where sustained throughput is the product, downloads, podcasts, firmware, video files, are CacheFly’s home turf and it still defends it credibly against far larger names.
In practice
Treat this pairing as two different questions. Already a Leaseweb infrastructure customer: trial its CDN first and let integration economics argue. Shipping large objects where transfer speed is the user experience: put CacheFly in the bake-off and hold its throughput claims to your own measurements, which is exactly the test it historically enjoys.
Large-object delivery is one of the easiest workloads to benchmark honestly. Send us a week of logs and we will run the field.