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Brand new PC starts to lag randomly, gets slow- while hardware usage is normal.

H

hyperion_

Junior Member
I don't get this. I consider myself almost "power user" of Windows, which means I keep my PC clean, run CCLeaner regularly, do not install any of "those" programs(toolbars, other useless crap) and also keep my browser secured with addons like NoScript, uMatrix, uBlock0 etc. I use no bloatware; most of my software is well reputed FOSS like Firefox, VLC, LibreOffice etc; and I try my best to keep the number of programs running in background as low as possible. I have an antivirus, and keep my definitions updated. I restart the PC every 2 days. In short, I do not do anything that usually causes PCs to slow down.

But still, every once in a while, the PC starts to lag. It ruins my entire session. Firefox takes upto 15 seconds(not kidding!!) to start, switching tabs takes 2-3 seconds, and scrolling is extremely jittery. Something as basic as rendering a reddit page(with the custom CSS turned off isn't instantaneous) /Even opening the start menu requires a good full second between me clicking the button and the menu popping up. Performance of other applications is horrible too

All the while Task Manager shows CPU, RAM and Disk usage as perfectly normal. I don't get it.

And then, just like that, in some sessions, it won't happen, like there was no problem ever. What do I do?
 
Install CrystalDiskinfo to check the SMART stats of your devices.
Check your event viewer, most likely disk errors, and that causing things to slow down.
 
Windows 10? That's normal, especially late at night, when it decides to "do stuff".

Then again, you could have an SSD on the way out.
 
Crystal Disk Info shows all columns as "Good." Yes its a Windows 10 machine. It has a mechanical HDD, not an SSD but hardware failure shouldn't be a reason because its barely 20 days old.

I just restarted the machine and this seems to have fixed it. Its running perfectly smooth right now. Every thing is just as it should be.

Could McAfee antivirus be a reason?
 
Windows 10 is a weird beast. I had to reinstall it at least twice to get rid of the symptoms you described. After anniversary update, it finally stabilized. Don't know it's the anniversary update or reinstall fixed the situation.

In the first year, sometimes Windows Explorer just won't respond for a few minutes, but task manager show very little CPU usage, can't move mouse or respond to keyboard, yet no obvious offending software or malfunctioned hardware.
 
I have the same type of stuff happen in Fire fox occasionally. Scrolling is sometimes laggy and keyboard input is slow with lag/delay. This is on a high end system too so I don't know what the hell's going on. I think it's just a firefox thing... Probably should try switching to chrome but I really don't want to.
 
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