Windows performance

PC that used to be fast has gradually gotten slower

A slow, creeping decline in speed over months or years is usually the accumulation of installed programs, browser extensions, temp files, and dust rather than any single dramatic cause.

Difficulty
Easy
Time
30–60 minutes
DIY cost
$0–$80
Pro cost
$80–$150

Symptoms

  • Speed decline happened gradually, not from one specific event
  • PC still boots and runs but everything feels a bit heavier than it used to
  • Many more programs installed than when the PC was new
  • Storage drive is much fuller than it used to be

Likely causes

  • CommonAccumulated startup programs and background apps added over timeEach new install has a chance of adding itself to startup or background processes.
  • CommonStorage drive gradually filling up with files, downloads, and temp dataLess free space affects performance broadly, not just storage capacity.
  • CommonDust buildup reducing cooling efficiency over months of useThis causes gradual thermal throttling that's easy to not notice happening slowly.
  • PossibleBrowser and OS updates adding features that use more resources than older versionsSoftware generally grows more resource-hungry over its lifetime.
  • PossibleAging hardware (drive, battery, thermal paste) naturally degrading with useMechanical and thermal components wear out gradually, not all at once.

What to do

  1. Review installed programs in Settings > Apps and uninstall anything you no longer use.
  2. Check Task Manager's Startup tab and disable anything unnecessary.
  3. Free up storage space using Settings > System > Storage and Storage Sense.
  4. Clean dust from vents and fans with compressed air, especially if it's been over a year since the last cleaning.
  5. Update all drivers, especially graphics and chipset, to their current versions.
  6. Run a full malware scan to rule out anything that's crept in unnoticed.
  7. Check whether your drive is an HDD, in which case an SSD upgrade would likely be the single biggest improvement.
  8. Consider whether the PC's age and specs (RAM especially) are simply behind current everyday software demands, in which case a RAM or storage upgrade is the practical next step.

Tools and parts

  • Compressed air
SSD or RAM upgradeSearch: “SSD or RAM upgrade for [your PC model]”

When to call a pro

If a thorough cleanup and driver/hardware check doesn't restore acceptable speed, a technician can assess whether the PC has simply reached the end of its useful upgrade path.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.