WordPress runs an enormous share of the web, which is why nearly every host claims to be "optimised for WordPress". The phrase means nothing on its own. What does mean something is exactly what the server does for you and what remains your job.
Let us separate those two, because confusing them is the source of almost every disappointment about performance.
What WordPress genuinely needs from a host
Four things, and none of them is "unlimited space".
A modern language version. WordPress runs on PHP, and newer versions are markedly faster than old ones, besides being the only ones still receiving security patches. Being able to pick and change the version from the panel, without asking anyone's permission, is a basic requirement. Here it is a dropdown.
A fast database with headroom. Every WordPress visit fires dozens of queries. A solid state drive changes that timing radically compared with a mechanical disk. It is the difference between a page that answers in half a second and one that takes three.
Enough processing capacity. This is the real limit of shared hosting, not storage. When several visitors arrive at once, each one consumes processor and memory. If the plan is too small the symptom is not a clear error: it is that the site slows down during your busiest moments, exactly when you can least afford it.
Server-level security. WordPress is the most targeted platform on the web precisely because it is the most used. Malware scanning, denial of service protection and automatic backups are not decoration: they are the difference between a one-afternoon incident and a one-week one.
What the server handles for you
The installation. From the panel, using the application installer, you have WordPress running in a couple of minutes, with the database created and passwords generated. Nothing to download, nothing to upload over FTP.
The security certificate. Activated from the panel, it makes the site open with the padlock. In practice it is mandatory: without it browsers flag the site as not secure and search engines penalise it.
Automatic backups. Managed from the panel, with restores of the whole site, the database, or individual files. For WordPress this counts double, because the typical disaster scenario is a plugin update that breaks something and the fix is rolling back.
Malware scanning. It inspects the account files and reports infected ones with their exact paths. On an install with twenty plugins, that listing saves you days of searching.
Support that understands WordPress. If the site returns an error, they will read the log and tell you what caused it. Mind the boundary: hosting diagnoses, it does not program. If a plugin is badly written, they will point at it; fixing it is development work.
What is on you, and it weighs more than you think
Here is the uncomfortable part: most slow WordPress sites are not the host's fault. They are the fault of decisions made on the site. A fast server with a badly built site is still a slow site.
Image weight. This is problem number one by a wide margin. A photo straight from a phone weighs several megabytes and is displayed in a four-hundred-pixel slot. Resizing before uploading and using modern formats typically halves load time. No amount of server optimisation compensates for a homepage carrying eight uncompressed photos.
Plugin count. It is not the number itself, it is what each one does. A plugin that loads its own styles and scripts on every page in order to work only on the contact form is costing you performance sitewide. Practical rule: if you have not used it in three months, uninstall it. A deactivated plugin is still attack surface.
The theme. Multipurpose themes with a bundled visual builder ship an enormous amount of code to cover every possible case, and your site loads all of it while using ten percent.
Caching. Without a cache, WordPress builds every page from scratch on every visit: it queries the database, runs the plugins, generates the HTML. With a cache, it serves an already-built version. It is the single biggest improvement you can make.
The day-one setup that prevents almost every problem
Do this on the first day, in this order. It is twenty minutes and it saves you months of headaches.
1. Activate the certificate and force the secure version before publishing anything. Do it later, with two hundred pages already loaded, and you will be chasing images and internal links still pointing at the insecure version.
2. Delete the factory content. Sample themes, plugins you will not use, the demo post. Less code, less attack surface.
3. Set the permalinks to the post name structure. Change it after Google has indexed the site and you will need redirects to avoid losing your rankings.
4. Install a cache and enable compression. This is the change you notice most.
5. Create an administrator with a real name and a long, unique password. Never "admin": it is the first username brute force attacks try.
6. Verify the backups are running and do a test restore of a single file, so you know how it works before you need it urgently.
The maintenance routine
Short and boring, which is exactly why it works.
Update the core, the plugins and the theme frequently. The vast majority of infections come in through an outdated plugin with a published vulnerability; bots start hunting for unpatched sites within hours of the announcement.
Before a big update, make sure you have a recent backup. With panel backups, if something breaks you roll back in minutes instead of improvising.
Review the administrator user list periodically. A user you did not create is the clearest sign there has been an intrusion.
And check your speed occasionally with a measurement tool. If it went slow one day, it is almost always because of something you added, not because the server got worse.
When shared hosting is no longer enough
There is a point where the problem stops being yours and becomes the plan's. The signs: the site slows down at certain hours and not others, the WordPress admin is sluggish even though the public site loads quickly, or you start seeing intermittent errors during traffic peaks.
That is the moment to move to semi-dedicated or a VPS. Before that, optimising is almost always the better move: compressing images, removing plugins and adding a cache usually delivers more improvement than changing plans, and it costs nothing.