Why Is My Computer So Slow? Common Causes and Fixes

January 15, 2026

A slow computer is one of the most common complaints we hear. Here are the most frequent causes and what you can do about them.

Too Many Startup Programs: Many programs set themselves to launch when your computer starts. Over time, this adds up and slows down boot time significantly. Disable programs you don’t need at startup.

Not Enough RAM: If your computer slows down when you have multiple programs open, you might need more memory. This is often an easy and affordable upgrade.

Old or Failing Hard Drive: Traditional hard drives slow down as they age. Upgrading to a solid-state drive (SSD) is one of the most impactful upgrades you can make.

Malware or Viruses: Malicious software running in the background can significantly slow down your computer. Keep your antivirus software updated and run regular scans.

Cluttered Hard Drive: When your hard drive is nearly full, your computer slows down. Delete files you don’t need and use external storage for large files.

Outdated Software: Running outdated operating systems and software can cause performance issues. Keep everything updated for the best performance and security.

If you’ve tried these tips and your computer is still slow, it might be time for professional help. BYTES USA can diagnose the problem and recommend the best solution.

Need help with this?

BYTES USA provides on-site technology support in Santa Monica. We’re happy to help.