What Is a VPS? Virtual Private Servers Explained for UK Businesses

The Three Tiers of Hosting — and Where VPS Fits

Most businesses start on shared hosting: your site lives on a server alongside hundreds of other websites, all sharing the same CPU, RAM, and network. It's cheap and zero-configuration, but the moment your neighbours have a traffic spike, so does your response time. You also have no control over the server environment — you can't install custom software, change PHP versions freely, or tune anything at the OS level.

At the other end is a dedicated server: a physical machine that is entirely yours. You get every CPU core, all the RAM, and no noisy neighbours. The trade-off is cost — even a modest dedicated machine in the UK starts at £60–£100/month, and you're responsible for all hardware maintenance.

A VPS (Virtual Private Server) sits in the middle. The physical host machine is still shared between several customers, but each VPS runs inside its own isolated virtual machine with a guaranteed allocation of CPU, RAM, and storage. Your 4 GB of RAM is always your 4 GB — nobody else can take it. You get full root access and can run any software a dedicated server could.

How Virtualisation Works

Modern VPS infrastructure uses a hypervisor — software that sits between the physical hardware and the virtual machines. At Glitch Servers we use KVM (Kernel-based Virtual Machine), which is the gold standard for performance because each VPS gets near-direct access to the hardware. There's no software emulation layer adding overhead.

KVM virtualisation means your VPS behaves like a real machine: it boots its own kernel, manages its own memory, and can run any operating system image — Ubuntu, Debian, AlmaLinux, Windows Server, and so on. You can install any package, configure any service, and it won't affect any other customer on the same host.

VPS vs. Shared vs. Dedicated: Side-by-Side

What Hardware Specs Actually Matter

Not all VPS products are equal. The physical hardware underneath your virtual machine has a direct impact on your workload performance, and there are a few specs worth understanding before you buy.

CPU: clock speed matters more than core count

For most web applications, game servers, and development environments, single-thread CPU performance is the limiting factor — not the number of cores. A 3.5 GHz Ryzen 9 7950X will run your PHP application, database queries, and game server tick loop faster than an older Xeon with more cores running at 2.4 GHz. At Glitch Servers, we build on AMD Ryzen 9 7950X processors specifically because of their combination of high clock speeds, large L3 cache, and modern Zen 4 architecture.

Storage: NVMe Gen4 vs. SATA SSD vs. HDD

VPS storage is one of the most impactful specs for day-to-day speed:

• NVMe Gen4 — sequential read speeds around 3,500–7,000 MB/s. Database queries, WordPress page generation, and compilation are noticeably faster. This is what we use.
• SATA SSD — around 500–550 MB/s. Fine for basic websites, but a clear bottleneck for I/O-heavy workloads.
• HDD — still used by some budget providers. Around 100–150 MB/s, with high latency. Avoid for any production workload.

RAM: DDR5 ECC vs. DDR4

Modern server platforms are migrating to DDR5 ECC (Error-Correcting Code) memory. ECC memory automatically corrects single-bit memory errors, which matters for database integrity and long-running server workloads. DDR5 also provides higher bandwidth than DDR4, which benefits memory-intensive applications like Redis, large SQL queries, and in-memory caches.

Network: upstream transit and peering

The network stack is often ignored in VPS comparisons, but it's the reason two servers with identical specs can have very different latency to end users. Our infrastructure connects to the internet through:

• NTT and GTT — Tier-1 internet transit carriers with global reach
• LINX and LONAP — direct peering at London's two largest internet exchange points, which means traffic to UK ISPs like BT, Sky, and Virgin Media takes a shorter, faster route
• AS212868 — our own autonomous system number, which gives us routing control and RIPE-registered IP space

For most UK users, this means consistently low latency — typically under 20ms from anywhere in the UK — without relying on a third-party carrier's routing decisions.

When Should You Move to a VPS?

Here are the clearest signals that your workload has outgrown shared hosting:

• Your site's response time regularly exceeds 500ms even during off-peak hours
• Your hosting provider limits PHP workers, database connections, or inode counts
• You need to install custom software (Node.js, Redis, Python, custom PHP extensions)
• You're running a game server, voice server, or any real-time application
• You're processing payments or handling personal data and need better isolation
• You're managing multiple client websites and need separate environments per client
• Your traffic has grown to a point where shared hosting's resource contention is measurably hurting performance

Managed vs. Unmanaged VPS

Most VPS products are unmanaged: you get root access and a clean OS installation, and the rest is up to you. This is fine if you're comfortable with Linux — installing nginx, configuring a firewall, setting up SSL, and keeping packages updated are all straightforward tasks.

If you'd rather not manage the server yourself, look for a managed VPS or consider a cPanel/WHM VPS plan, which gives you a graphical control panel and handles many common server tasks through a browser interface rather than the command line. At Glitch Servers, our cPanel VPS options include LiteSpeed web server, CloudLinux for PHP isolation, and Imunify360 for malware scanning pre-configured.

Summary

A VPS gives you the control and isolation of a dedicated server at a fraction of the cost. The key things to look for when choosing a UK VPS provider are: KVM virtualisation (not OpenVZ), NVMe storage (not SATA SSD or HDD), modern CPU hardware (Ryzen or recent Intel), ECC RAM, and a network that peers directly at LINX and LONAP rather than routing everything through a single upstream carrier.

If you're currently on shared hosting and running into performance limits, a VPS is almost certainly the right next step.