A quick practical guide to reading Task Manager and Resource Monitor and turning the numbers into concrete action. If your PC is slow, start here before reinstalling or buying components. This article covers Microsoft Windows; for general optimisation, see our guide to cleaning and optimising your PC without reinstalling Windows. If you need a licence or an OS upgrade, consider a Windows 11 Pro licence from Licensgo.

1Step 1 — Open Task Manager and Resource Monitor

Press Ctrl+Shift+Esc to open Task Manager. For the full view, click ‘More details’. To see I/O per disk and per network, open Resource Monitor from the ‘Performance’ tab (‘Open Resource Monitor’ button).

Start with the Overview: CPU%, Memory, Disk active time and Commits are the primary indicators of load and bottlenecks.

  • Task Manager for process-level CPU and memory;
  • Resource Monitor for disk I/O, handles and threads;
  • Performance tab for overall counters and graphs.
Quick access

Ctrl+Shift+Esc opens Task Manager. In Resource Monitor, sort by ‘Total (B/sec)’ to spot heavy disk users.

2Step 2 — Read CPU metrics and spot culprits

Look at overall CPU usage first. Sustained usage above ~80% on multi-core systems indicates CPU pressure for demanding tasks. Check the ‘Processes’ list for processes with high CPU% and the ‘Details’ tab for per-thread spikes.

If a single process uses a lot of CPU, check its publisher/command line, then update or restart the app. For unknown or unsigned processes, consider scanning with your antivirus.

  • CPU bottleneck: sustained 80%+ and slow responsiveness;
  • single-process spike: check the details, then restart or update the process;
  • unknown high-usage process: scan for malware and investigate.
When to upgrade the CPU

Consider a CPU upgrade only if monitoring shows consistently CPU-bound workloads; otherwise, optimise the software first.

3Step 3 — RAM usage and virtual memory

In Task Manager's Performance > Memory view, check used, cached and available memory. High memory use with low ‘Available’ memory and heavy disk activity usually means paging (use of the page file), which slows the system down.

To adjust virtual memory (page file), open System Properties > Advanced > Performance settings > Advanced > Virtual memory. Let Windows manage it unless you have a specific need; increasing the page file is a temporary fix, not a substitute for physical RAM.

  • normal: high cache and low paging;
  • problem: frequent disk spikes and a high ‘Hard Faults/sec’ value;
  • solution: close unused apps, consider adding RAM if paging persists.
Short-term fix

Close browser tabs and background apps; this often reduces paging immediately.

4Step 4 — Disk activity and I/O bottlenecks

In Resource Monitor watch Disk Activity: average response time (ms), bytes/sec and the processes holding handles to large files. A common sign of a disk bottleneck is disk usage near 100% with high response times and UI stalls.

If you see heavy page file activity, frequent antivirus scans or a single process doing many small reads/writes, the practical answer is often an SSD. Moving Windows and frequently used apps to an SSD provides the largest perceptible speed-up.

  • signs: high disk active time and long response times (ms);
  • interim actions: stop heavy processes, schedule antivirus scans for off-peak times;
  • long-term: upgrade to a SATA/NVMe SSD for faster boot and app loading.
Measured gains

Typical gains from HDD → NVMe SSD: boot times 2–5x faster, app launch and file operations significantly snappier.

5Step 5 — Concrete actions: kill, tune, upgrade

To reduce the immediate load, end non-essential tasks in Task Manager, restart resource-intensive apps and disable unnecessary startup programs. For persistent problems, adjust virtual memory or plan a hardware upgrade.

Before making hardware changes, back up your data. Licensgo recommends using a reliable backup solution; see our article on practical backup strategies and consider a dedicated image backup tool such as Acronis True Image Premium for full-disk backups.

  • short-term: end tasks, reboot, update drivers and apps;
  • medium-term: tune virtual memory and disable heavy startup programs;
  • long-term: add RAM if paging persists; upgrade from HDD to SSD on I/O-bound systems.
Upgrade decision

If monitoring shows >20% average page file reads and frequent high disk latency, choose RAM + SSD rather than just one of the two.

6Step 6 — Regular checks and prevention

Schedule periodic checks: a quick weekly glance at Task Manager and Resource Monitor catches regressions. Keep Windows and drivers updated, and avoid installing untrusted software.

If you keep a stable baseline, any deviation becomes obvious and easier to fix — that's the value of simple monitoring before big interventions.

  • check Task Manager and Resource Monitor weekly;
  • keep backups and system images updated;
  • document recurring issues and act on the confirmed bottleneck.
Pro tip

Collect a Process Monitor (Procmon) trace only if you need deep I/O diagnostics; it's powerful but verbose.