A slow WordPress site can almost always be fixed with a few changes. Try them in this order and check how it loads after each one.
- Turn on a caching plugin. It stores pages already built and serves them much faster.
- Shrink your images. Upload them at the size they're displayed and use a plugin that compresses them (or WebP format).
- Remove plugins you don't use. Every active plugin adds work to every visit. Deactivate and delete the extra ones.
- Use a recent PHP version. Change it from PHP version (first check your plugins are compatible).
- Update WordPress, your theme and plugins. Besides being faster, they're more secure.
If your site gets many visitors at once (a store during a sale, for example) and slows down right then, the limit is usually the number of PHP processes. You can add the +10 PHP processes add-on or move to Cloud Hosting.
Before installing new plugins or switching PHP versions, create a backup.
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