Computer suddenly starts running slow

[Regrettings]

I was playing a game when the fps started getting low, and it gradually got worse over time. I suddenly realized that my power cord wasn't connected to the computer, and it was running low on battery, so I charged it. After charging, nothing changed, my browser was slow, games lagged, youtube videos would lag behind audio, then speed up again, everything just acted really bad. CPU usage was always around 100%, and before all this my computer was perfectly fine, extremely fast, and I usually would get 144 fps in the game, but now I get 2-12. I've tried malwarebytes, safe mode, clean startup, reboot, letting it rest overnight, running with ac but  no battery, using bios optimized defaults, ccleaner clean, and ccleaner registry clean.

I have never encountered this problem before, is it a virus or did I burn/break something?

[Dragon-Fur · Accepted solution]

@Regrettings

Welcome to the HP Community Forum.

Some Ideas

Try a Hard / Forced Reset:

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Hard / Forced Reset

• Close running programs, browsers, and games

Next

• Create a Restore Point:   Create a Restore Point – Win7  OR  Create a restore point Win8

If you are using a Notebook

• Close all your programs and shut down the computer
• Disconnect everything (little Unifier for the keyboard / external mouse can stay)
• Perform the Forced Reset for your notebook model
• Boot the computer and log in

ELSE, if you are using a Desktop computer

• Close all your programs and shut down the computer
• Disconnect USB drives, speakers, other unnecessary devices
• Unplug the computer for thirty seconds
• Connect the power (plug in)
• Reconnect devices
• Start / Boot the computer and log in

Reminder:  Forced Reset is a device Reset.  The procedure does not wipe out your files nor does it destroy your Windows setup in any way.  The Forced Reset “forces the system to clear and reestablish the software connections between the BIOS and the hardware.”

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More...

• Try reinstalling your game.

• Take a look at general performance from the perspective that the computer is probably not infected -- it could be, but that might be a coincidence based on timing rather than running a computer on battery -- consider that the system may like to have some maintenance.

Improving System Performance without Adding Memory (Windows 7)

• Having the system thrashing about may have upset one of the programs that would ordinarily behave itself.  Have a look at the Resource Monitor -- check what is running, how much resource each program is using, and whether those programs that are running are behaving as expected (not running amuck and stealing all the resources).

How to use the Resource Monitor in Windows 7

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[Regrettings]

Strange enough, the hard force reboot worked