VPS plans are marketed on a short list of headline specs: RAM, vCPU count, storage, and bandwidth. Some of those numbers matter a great deal for web hosting workloads. Others matter much less than you'd expect. Here's how to read a VPS spec sheet critically, what to benchmark before committing, and what specs don't tell you at all.
RAM is the single most important specification for web hosting workloads. PHP-FPM workers, MySQL, the operating system, and any object caching layer (Redis, Memcached) all compete for available memory. When RAM is exhausted, the Linux OOM (Out of Memory) killer starts terminating processes, typically the largest memory consumers first, which are often your database or PHP workers. The result is 502/503 errors and database connection failures at exactly the moment traffic demands are highest.
Practical RAM requirements: 1GB is the minimum for a single WordPress site with light traffic. 2GB handles a moderate WordPress or WooCommerce site comfortably with Redis object caching and LiteSpeed Cache. 4GB supports multiple sites or a busy WooCommerce store during peak periods. 8GB+ is appropriate for high-traffic sites, multiple concurrent applications, or sites running memory-intensive operations like image processing or large database queries.
When comparing VPS providers, note that advertised RAM is not the same as available RAM. The OS itself consumes memory, typically 200–400MB for a minimal Ubuntu installation. A "1GB RAM" VPS has roughly 600–800MB available for your applications after the OS. Factor this into your calculations and don't cut RAM margins too tight.
vCPU count matters less than most people expect for typical web hosting workloads. A single well-performing vCPU handles most WordPress sites comfortably, web serving is primarily I/O bound, not CPU bound. The exceptions are image-heavy sites doing server-side image processing, sites running WP Cron heavily or executing complex background jobs, and PHP applications doing significant computation per request.
What matters more than vCPU count is vCPU quality, how much actual CPU time your virtual core receives. VPS providers vary significantly in how they allocate physical CPU to virtual cores. Budget providers that oversell their CPU allocations result in "noisy neighbour" problems where busy VPS instances on the same physical host degrade performance for all other instances on that hardware. This is impossible to determine from a spec sheet alone.
The practical way to evaluate CPU quality: provision a VPS on a trial basis and benchmark with sysbench. Run sysbench cpu --cpu-max-prime=20000 run and compare results against known benchmarks for similar hardware. Geekbench single-core scores are also useful. If the numbers are significantly below expected values for the hardware class advertised, you're on an oversold host. Test during peak business hours as well as off-peak, the difference between the two reveals how much CPU contention exists.
Storage type has a material impact on database-driven applications. NVMe SSDs offer random read/write speeds in the range of 3,000–7,000 MB/s. SATA SSDs deliver 400–600 MB/s. Spinning HDD delivers 80–160 MB/s and high random I/O latency that's damaging for database workloads. Never choose HDD storage for web hosting workloads, the performance difference is immediately visible in database query times and PHP execution speed.
NVMe versus SATA SSD: for most WordPress sites, SATA SSD is adequate. The NVMe advantage becomes significant for WooCommerce stores with large product catalogues, sites running complex database queries, or high-traffic applications where dozens of PHP workers are hitting the database concurrently. If you're choosing between two providers and one offers NVMe at comparable price, take NVMe, but don't pay a significant premium for NVMe if RAM and CPU quality are the constraints your workload actually hits first.
Bandwidth is almost never a practical constraint for web hosting workloads. Most VPS providers offer 1–4TB of monthly transfer, and typical web hosting traffic consumes a fraction of that. The exception is media-heavy sites serving large video files or downloads directly from the VPS, for these, a CDN (Cloudflare, BunnyCDN) offloads bandwidth-intensive content delivery and makes this a non-issue.
Network port speed matters more than raw bandwidth allocation. A VPS with a 1Gbps uplink can serve content significantly faster than one with a 100Mbps uplink during concurrent request spikes. Most reputable providers offer 1Gbps or better, verify this if you're comparing budget options, as 100Mbps shared ports occasionally appear on entry-level plans.
Network latency to your target audience is meaningful for uncached dynamic content (PHP responses that aren't served from cache). Cloudflare or a CDN handles geographic latency for static assets regardless of where your server is, but a PHP-generated page for a UK visitor being served from a US-based VPS adds 80–100ms of base latency to every uncached request. Choose a data centre location that's geographically close to your primary audience.
The web server software running on a VPS is not a spec listed on the provider's pricing page, but it has a significant impact on performance, particularly for WordPress. LiteSpeed Web Server is measurably faster than Apache for PHP workloads: it handles concurrent connections more efficiently, supports HTTP/3, and integrates with LSCache for server-level WordPress page caching that Apache doesn't offer natively. Nginx performs comparably to LiteSpeed for static file serving but requires additional configuration for WordPress caching.
If you're evaluating managed VPS providers and choosing between Apache and LiteSpeed environments, LiteSpeed is the better choice for WordPress hosting. The real-world performance difference in TTFB and pages-per-second throughput is consistently measurable. It's worth paying a modest premium for or seeking out actively rather than defaulting to the Apache stack.
The spec sheet tells you nothing about: network reliability and uptime history, support quality and response times, the provider's operational practices during incidents, or how backups are handled. These operational factors often matter more than raw hardware specs for production hosting.
Evaluate these carefully: Does the provider have a genuine SLA with service credit compensation, or just a marketing uptime promise? What are the support channels and response time commitments for VPS customers? Are daily backups included or charged separately? Is there a management console (KVM over IP or equivalent) that lets you access the server if SSH is unreachable? These questions separate a provider with good specs and poor operations from one that's actually reliable for production workloads.
HostBible VPS plans use NVMe SSD storage and LiteSpeed web server, with data centre locations optimised for UK and European audiences. Managed options available.
View VPS Plans