How to Speed Up a Gaming PC in 2026 — 10 Fixes for Stutters, Lag and Slow Load Times

Your gaming PC was fast when you built it. Now it stutters in the same games it used to run smoothly. Before you spend money on new hardware, work through these fixes — most slow gaming PCs are software problems, not hardware ones.

Short Answer: Enable Windows Game Mode and Hardware-Accelerated GPU Scheduling first — they’re free and take 30 seconds. Then clear your startup programs (95% of PCs have useless software launching at boot), update GPU drivers, and check your storage health. These four things fix most performance regressions without spending anything.

Fix 1 — Enable Windows Game Mode

Windows Game Mode dedicates more CPU and GPU resources to your game and suppresses background tasks during gaming. Enable it: Settings → Gaming → Game Mode → On. It activates automatically when Windows detects a full-screen game. No reboot required.

Fix 2 — Enable Hardware-Accelerated GPU Scheduling (HAGS)

HAGS reduces the CPU workload for GPU scheduling, which can reduce latency and stuttering in GPU-bound games. Enable it: Settings → Display → Graphics → Change default graphics settings → Hardware-Accelerated GPU Scheduling → On. Requires a Windows 10 May 2020 update or later, and a GeForce 10 series / AMD RX 5600 or newer GPU.

Fix 3 — Clean up startup programs

Every program that launches at boot consumes RAM and CPU during startup — and many never release those resources fully. Common offenders: Discord (runs at 300–400MB in background), Steam, Epic Games Launcher, OneDrive, Spotify, Razer Synapse, Corsair iCUE. Open Task Manager → Startup Apps → disable everything you don’t need at boot. You can launch these manually when needed.

Fix 4 — Update your GPU drivers

NVIDIA and AMD release drivers with game-specific optimisations regularly. An outdated driver for a recently released game is a common cause of unexpected stuttering and lower-than-expected performance. Update via GeForce Experience (NVIDIA) or AMD Software (AMD). Do a clean driver install (DDU — Display Driver Uninstaller) if you’ve had multiple driver versions installed and experience stability issues.

Fix 5 — Check your storage health

A degrading SSD shows up as dramatically slower game load times and stutters caused by read errors. Check your storage health with CrystalDiskInfo (free). An SSD reporting “Caution” or “Bad” health needs to be replaced before it fails completely — game stuttering from I/O errors is a warning sign.

Fix 6 — Clear shader caches

Corrupt or bloated shader caches cause stuttering in GPU-accelerated games. Clear them: NVIDIA Control Panel → Manage 3D Settings → Shader Cache Size → Click to clear. Steam also stores shader pre-compilation caches — Steam → Settings → Downloads → Clear Download Cache. This forces a rebuild on next launch, which eliminates cache corruption issues.

Fix 7 — Set your power plan to High Performance

If your PC is on a Balanced power plan, Windows throttles CPU speed dynamically to save power. During gaming, this causes microstutters as the CPU ramps up and down. Switch to High Performance: Control Panel → Power Options → High Performance. Or install your motherboard’s performance control software for a “Gaming Mode” that also optimises RAM speed and CPU boost behaviour.

Fix 8 — Check RAM speed and XMP/EXPO

Most gaming PCs are unknowingly running RAM at below-rated speed. DDR5 or DDR4 kits often ship at base JEDEC speed (2133 or 3200 MHz) rather than their rated speed (5600 or 6000 MHz) until you manually enable XMP (Intel) or EXPO (AMD) in your BIOS. This can provide 5–15% performance gains in CPU-limited games. Enter BIOS at startup → find XMP/EXPO profile → enable → save and exit.

Fix 9 — Control thermals (clean your PC)

Thermal throttling cuts CPU and GPU performance when temperatures exceed safe limits. Symptoms: FPS drops that correlate with a few minutes of sustained gameplay. Check temperatures with HWMonitor or MSI Afterburner. CPU thermal paste degrades over 3–5 years — reapplying Noctua NT-H1 or Thermal Grizzly Kryonaut is a £10 fix that can restore 10–30% of lost CPU performance. Clean dust from fans and heatsinks with compressed air.

Fix 10 — Defrag your HDD (not SSD)

If you still have games on an HDD, fragmentation genuinely hurts load times. Windows should defrag automatically but check: search “Defragment and Optimise Drives” → select your HDD → Optimise. Never defrag an SSD — it reduces lifespan and Windows handles SSD optimisation via TRIM automatically.

Quick speed-up sequence (free, takes 10 minutes):
Enable Game Mode → Enable HAGS → Disable startup bloat → Update GPU drivers → Clear shader cache → Set High Performance power plan

Checklist — Speed up gaming PC:

✅ Game Mode on
✅ HAGS enabled (NVIDIA/AMD, Windows 10 2020+)
✅ Startup programs trimmed
✅ GPU drivers updated
✅ Storage health checked (CrystalDiskInfo)
✅ Shader caches cleared
✅ Power plan set to High Performance
✅ XMP/EXPO enabled in BIOS
✅ Thermals checked, dust cleared

FAQ

Will cleaning my PC really improve gaming performance?

Yes, if thermal throttling is occurring. A dusty PC with 95°C+ CPU temperatures will boost-clock at reduced frequencies to avoid damage. Cleaning dust and reapplying thermal paste can restore full boost performance.

Should I use a PC optimiser app?

Most PC optimiser software (CCleaner, IObit, etc.) do some useful things (clearing temp files, managing startup) and some harmful things (registry “cleaning” that can cause instability). The manual fixes above achieve the same useful results without the risk. If you prefer an app, Razer Cortex is specifically designed for gaming performance and is relatively trustworthy.

Does reinstalling Windows fix gaming performance?

Yes, as a nuclear option. A fresh Windows install eliminates driver conflicts, startup bloat, and accumulated system cruft. It’s time-consuming but effective. Before doing it, try the fixes above — they achieve 80% of the benefit in 5% of the time.

VPN Picker →

Only How to Fix All Techtippr updates Subscribe now on Telegram

*As an Amazon Associate I earn from qualifying purchases.