A fully cached site with millions of pageviews can consume less server capacity than a smaller membership/search-heavy dynamic site. Size WordPress from cache hit ratio, PHP requests, database queries and cron load.
Managed high-resource hosting can be enough when root and custom tuning are unnecessary. VPS/VDS provides more control for custom Nginx/LiteSpeed, Redis, PHP-FPM pools, cron and database tuning. EKA's LiteSpeed page specifically positions it for high-traffic sites and e-commerce.
A cache hit can be served at CDN/web-server level while a cache miss reaches PHP and the database.
CDN and full-page caching can serve anonymous traffic at edge/web-server level; dynamic requests continue to PHP-FPM and MySQL.
A bad plugin or query can remain bad on a larger VPS.
Start with read-only checks before changing production.
wp plugin list --status=activewp cron event list --format=countfree -hiostat -xz 1 5ss -sps aux --sort=-%cpu | headSolve the measured bottleneck instead of jumping directly to the most expensive architecture.
There is no single number. Measure cache hit ratio, dynamic requests, logged-in users and database query cost.
Proper server-side caching and HTTP handling can help, but benchmark the real application.
No. Object cache can help dynamic/query-heavy sites but may be unnecessary for small static sites.
Share traffic, cache hit, active plugins, WooCommerce/membership use and DB size; we can choose hosting or VPS.