How to Fix High CPU Usage in WordPress

High CPU usage can make a WordPress website slow, cause errors, affect other websites on the same hosting account, and eventually exceed the resource limits of your hosting plan.

WordPress itself isn't always the direct cause. High CPU usage can result from poorly optimized plugins, heavy themes, excessive database activity, bots, scheduled tasks, malware, traffic spikes or a website that has simply outgrown its current hosting resources.

This guide explains practical steps you can take to reduce high CPU usage on a WordPress website.

1. Check Your Hosting Resource Usage

Before changing anything, confirm whether your website is actually reaching its hosting limits.

Log in to cPanel and look for Resource Usage, CPU and Concurrent Connection Usage, or the equivalent resource-monitoring option available on your hosting account.

Check for repeated CPU, memory, entry process or I/O limit events.

A short CPU spike doesn't necessarily mean something is wrong. Repeated or sustained high usage should be investigated.

2. Update WordPress, Plugins and Themes

Outdated WordPress components can cause performance, compatibility and security problems.

From your WordPress dashboard, check for updates to:

• WordPress core

• Plugins

• Themes

Before performing major updates on an important website, create a backup.

You should also remove plugins and themes you no longer use rather than leaving unnecessary software installed.

3. Identify Resource-Intensive Plugins

Plugins are a common source of high WordPress CPU usage.

Some plugins continuously perform database queries, background processing, external API requests or scheduled tasks.

Temporarily disabling suspected plugins can help determine whether a particular plugin is responsible for excessive resource consumption.

Pay particular attention to plugins that perform:

• Backups

• Security scans

• Statistics collection

• Broken-link scanning

• Related-post processing

• Image processing

• Import and export operations

• Frequent external API requests

• Database optimization

• Scheduled background tasks

Don't disable essential plugins blindly on a production website. Test carefully and use a staging environment where possible.

4. Enable WordPress Caching

Without caching, WordPress may need to execute PHP and database queries every time somebody requests a page.

Caching can reduce this workload by serving previously generated content when appropriate.

Beta Host servers using LiteSpeed can work with WordPress caching solutions designed for LiteSpeed environments.

Configure caching carefully and test important website functions afterward, particularly:

• Login areas

• Shopping carts

• Checkout pages

• Customer dashboards

• Dynamic forms

Dynamic pages shouldn't be cached incorrectly.

5. Use a Supported PHP Version

PHP versions can affect WordPress performance, security and compatibility.

Use a currently supported PHP version that is compatible with your WordPress installation, theme and plugins.

Don't switch PHP versions solely because a newer number is available. Check compatibility first and maintain a backup before changing the PHP environment of an important website.

Beta Host customers can change supported PHP versions through cPanel where the option is available.

See our knowledgebase guide:

How to Change PHP Version in cPanel

6. Optimize Your WordPress Database

Over time, a WordPress database can accumulate unnecessary information such as revisions, expired transients and data left behind by removed plugins.

Database optimization may reduce unnecessary queries and improve performance.

Always back up your database before performing cleanup or optimization.

Avoid running aggressive database-cleaning operations without understanding what will be deleted.

7. Check WordPress Cron Jobs

WordPress uses WP-Cron to perform scheduled tasks.

Plugins may use it for:

• Scheduled publishing

• Backups

• Email processing

• Data synchronization

• Security scans

• Automatic cleanup

• External API requests

A badly configured plugin can create excessive scheduled jobs and contribute to high CPU usage.

If your website has many scheduled tasks or significant traffic, reviewing the WordPress cron configuration can help identify unnecessary background activity.

8. Protect Your Website From Bots

Not every visitor consuming server resources is a real person.

Bots can repeatedly request WordPress pages, login forms, XML-RPC endpoints and other resources.

Large numbers of automated requests can significantly increase CPU usage.

Consider using appropriate security controls, rate limiting and a reputable CDN or web application firewall where suitable.

However, avoid blocking legitimate search-engine crawlers such as Googlebot if you depend on organic search traffic.

9. Check for Malware

Unexpected CPU usage can sometimes indicate a compromised WordPress installation.

Malicious scripts may send spam, generate unwanted pages, make external connections or perform other resource-intensive activities.

If CPU usage suddenly increases without a corresponding increase in legitimate traffic, check:

• WordPress administrator users

• Recently modified files

• Unknown plugins

• Unknown themes

• Suspicious cron jobs

• Unexpected PHP files

• Website access logs

Change compromised credentials and update vulnerable software immediately if an intrusion is discovered.

10. Optimize Images and Website Assets

Large images mainly affect bandwidth and page-loading performance, but an inefficient website can also increase overall server workload.

Compress images appropriately and avoid serving unnecessarily large files.

You can also reduce unnecessary JavaScript, CSS and third-party scripts where practical.

11. Review Your Theme

A poorly optimized WordPress theme can generate excessive database queries or PHP processing.

If high CPU usage started after installing or updating a theme, investigate the theme as a possible cause.

Use actively maintained themes from reputable developers and keep them updated.

12. Avoid Excessive WordPress Plugins

There isn't a universal number of plugins that every WordPress website should stay below.

Ten badly coded plugins can cause more problems than thirty well-optimized ones.

Instead of focusing only on the number of plugins, consider what each plugin does and how much server activity it generates.

Remove unnecessary plugins and avoid installing several plugins that perform the same function.

13. Investigate Traffic Spikes

High CPU usage isn't always caused by poor optimization.

Your website may simply be receiving more traffic.

Review your website statistics and server logs to determine whether resource usage corresponds with an increase in legitimate visitors.

If the traffic is genuine and sustained, optimization may help, but the website may eventually require additional hosting resources.

14. Consider Whether You've Outgrown Shared Hosting

Shared hosting is suitable for many WordPress websites, but resources aren't unlimited.

A growing e-commerce website, busy news platform, membership website or resource-intensive application may eventually require more CPU, memory and control than a shared hosting environment can provide.

If you've optimized the website and legitimate traffic still regularly pushes it to its resource limits, upgrading may be the appropriate solution.

Depending on your requirements, this could mean moving to a higher-resource WordPress hosting plan, VPS or dedicated server.

Don't Ignore Sustained High CPU Usage

Repeated high CPU usage affects more than website speed.

It can cause:

• Slow page loading

• HTTP errors

• Failed background processes

• WordPress administrator delays

• Checkout problems

• Database connection issues

• Hosting resource-limit errors

Finding the actual cause is better than repeatedly applying temporary fixes.

Need Help With High CPU Usage?

If you're a Beta Host customer experiencing high CPU usage, review your cPanel resource statistics first and check your WordPress plugins, theme, caching, database and traffic.

If the issue appears to be server-related or you need help understanding your hosting resource usage, contact Beta Host technical support through the client area.

Our support team can help identify hosting-level resource issues and advise whether your website requires optimization or additional hosting resources.