Choosing a VPS for a website with high traffic
Compare CPU, memory, disk and network needs. Test performance under load and plan resource upgrades for a busy website.
A website with many visitors needs a server configuration based on measurements. The total number of visitors per day does not show all the resources required: a cached article and a product search can place very different demands on the same VPS. Measure simultaneous requests, response times, CPU use, available memory and database activity during busy periods.
Choose memory with enough capacity for the operating system, application and database. Leave space for traffic growth and background jobs. For storage, consider both capacity and read/write performance; product imports, backups and database queries can compete for disk access. A large disk alone does not solve slow queries.
Check network limits separately from the advertised port speed. Find out how included traffic is counted and what happens when its allowance is exceeded. Compare connection delays from the countries where your customers live, especially for pages that cannot be cached.
Before launch, test typical customer actions with increasing numbers of simultaneous users. Include login, search and checkout where applicable. Identify which resource becomes overloaded first. Improve caching or application queries before buying more capacity.
Ask how resource upgrades work, whether a restart is necessary and how long changes take. Write down how monitoring alerts, backups and data recovery are organised. A single VPS remains a possible point of failure, so availability requirements may justify a separate recovery server.