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On shared hosting your account lives in a compartment with ceilings of its own for processor (CPU), memory (RAM) and disk reads and writes (I/O). They exist so a noisy neighbour cannot take the machine from you, and the other way round. Knowing what each does when it runs out saves a lot of time, because each fails in a different way.
The three, side by side
| Resource | What it is | What happens at the ceiling |
| CPU | The processing time your account may use. It runs PHP, builds pages, compresses images. | It slows down. The site answers, but slowly. That is why it looks like sluggishness and not an error, and nobody suspects it. |
| RAM | The memory your account works with at once: code, each request’s data, imports. | It fails. A blank page, a critical error, an import that stops halfway. |
| Disk I/O | The speed at which the account reads and writes files, and how many operations it does per second. | It slows down. Backups, unzipping, big imports and badly managed caches are the usual culprits. |
Besides these three there is the number of processes and simultaneous requests, which do not measure how heavy one thing is, they measure how many things there are at the same time. See entry processes and the limits nobody advertises.
Reading it in the panel, step by step
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| The account’s RAM is not PHP’s memory_limit. PHP’s is the most one single request may use; the account’s is the total shared by everything running at once. Raising PHP’s gives you no new resources. See PHP limits. |
| Where the consumption comes from is usually the site, not the plan. See what eats CPU on a website, and how to bring it down. The fast disk of a bigger plan does not fix a badly written query. On the type of disk, see SSD or NVMe storage: does the difference matter for a website. |
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Looked at the graphs and cannot tell what they say? Send us a screenshot of Resource Usage and we will tell you what is hitting the ceiling. Open a support ticket |
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SEE ALSO The limits nobody advertises: inodes, processes and memory What eats CPU on a website, and how to bring it down |
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