FPS drops randomly on PC: find the cause, then fix it

What a random FPS drop usually is

It helps to be precise about the symptom, because three different problems get described the same way. A frame rate that is low all the time usually means the hardware is at its limit for the settings you chose. A stutter is a single long frame, a hitch you notice rather than a slowdown you can watch, which the Windows 11 stuttering guide covers. A freeze is the game stopping for a second or more, covered in game freezes then continues.

A random drop sits between those: the frame rate falls noticeably for several seconds, sometimes longer, and then recovers without you doing anything. Something intermittent is either taking resources the game was using, or the hardware is protecting itself. Both leave clear traces if you watch at the right moment, which is what the rest of this page is about.

The usual causes, and what gives each one away

How to catch the cause in the act

Random drops are frustrating because they are gone by the time you look. Set things up so the evidence is already on screen when one happens:

1. Install MSI Afterburner with RivaTuner Statistics Server and turn on the on-screen display for frame rate, frame time, processor usage per core, graphics card usage, temperatures, memory and video memory.
2. Play normally until a drop happens, and note which of those readings changed at the same moment.
3. If nothing in the overlay moved, switch to Task Manager during the next drop and sort by processor, then disk, then network to see what jumped.
4. Afterwards, open Reliability Monitor from the Start menu and look for driver resets or application errors at the time of the drop.
5. Note whether drops follow the clock, such as a few minutes in or on the hour, or follow the game, such as one map or one kind of fight. The first points at your PC; the second points at the game.

That single pattern, clock or game, usually rules out half the causes in the table on its own.

Fix: stop background work interrupting play

If drops line up with activity from another program, the fix is to move that work out of your playing time rather than to find a clever setting. Set Windows Update's active hours to cover when you play, and keep Game Mode on so updates hold off installing drivers and prompting restarts mid-session. Schedule antivirus scans for a time the PC is idle instead of letting them start whenever the machine seems quiet.

Cloud storage clients, game launchers and chat apps are frequent offenders. Pause syncing while you play, and check each launcher's download settings: several can download updates during gameplay unless told not to. Background recording in the Xbox Game Bar keeps the graphics card encoding video continuously; if you never save clips, turn it off, as the Game DVR reference explains. Finally, trim Settings, Apps, Startup so fewer programs are running to wake up in the first place.

Fix: heat and power limits

When a processor or graphics card reaches its temperature limit it slows itself down, and frame rate follows. No software setting overrides that safely. Clean dust from fans and heatsinks, make sure case fans move air through rather than around the case, and on a laptop, play on a hard surface that leaves the intake vents clear. If temperatures only climb in one game, that game is simply the heaviest load, and lowering its settings reduces the heat as well.

Power limits look similar but are a policy rather than a physical limit. On a laptop, check that it is plugged in and that neither Energy Saver nor a quiet mode in the manufacturer's control app is active. On any PC, the power plan and processor state settings decide how readily the processor reaches full speed under sudden load; core parking and processor states and power throttling describe the settings involved.

Fix: memory and video memory running short

Games that run out of video memory move data into slower system memory, and games that run out of system memory lean on the page file, which is slower again. Either shows up as drops when new areas load or many effects appear at once. The quickest check is whether video memory use sits right at the card's capacity during a drop. If it does, lowering texture quality usually solves it with less visual cost than any other setting.

For system memory, close browsers and other heavy programs before playing, and leave the page file enabled and managed by Windows, because turning it off converts a slowdown into a crash, as the page file reference explains. It is also worth confirming your memory is running in dual channel and at its rated speed; the XMP and EXPO reference covers memory profiles.

Fix: drivers and overlays

If drops began right after a graphics driver update, install the previous version from the card maker's website and see whether they stop. If they began at no obvious moment, a clean installation of the current driver is still worth trying, because leftover settings from older drivers occasionally cause trouble. Update the motherboard chipset driver from the board or PC maker as well.

Overlays are the other common suspect: performance overlays, voice chat overlays, recording software and launcher overlays all hook into the game's rendering. Turn them off one at a time, playing between each change, so that if drops stop you know exactly which one was responsible.

Where an optimizer fits, once you know the cause

A Windows optimizer can help with two of the causes on this page: background interference and power behaviour. It cannot help with heat, with a game that is simply too heavy for its settings, with video memory, or with a faulty driver, so identify the cause before spending anything. Which optimizer changes affect FPS explains which categories are worth testing.

JINSHI PC Tweaks, our product, gathers the power, background and recording settings from this page into one place, publishes each change on the complete tweak list and reverses each individually. Every fix above works by hand for free; the app is a shortcut, not a requirement. If you want the shortcut, the JINSHI Tweaks homepage shows what PC Tweaks covers. For a wider checklist, see how to choose a PC optimizer for gaming.