At last, you would face that once rocketing-fast PC is running slow like a sloth, even though it comes with Windows 10, the best Windows design with the fastest performance. Most user would Google for “why is my computer so slow” and have already blamed on the hardware and try to replace the machine. But, in fact, many other factors can cause the slowness problem.

In this article, some possible causes and the relative solution will be introduced to you. They are not that hard actually, so you can go through them before you decide to drop the money on Amazon.

Reason 1: Low Disk Space

When your hard disk almost runs out of the memory space, Windows would cost much more time to access needed files or programs, and at the same time, there will be no enough space for swap files and temporary files. Thus, your computer runs slow.


1. Clean your hard disk with Disk Cleanup tool. 

Type Disk Cleaner in the search box from the Start menu, then a window pop out and ask you to choose a disk to analyze. This would take a long while of your already slow running PC.

After the scanning finished, you should choose to clean the temp file at least.

2. Use the Big File manage tool to clean the big and unwanted files

For this, you can download and install the optimization tool, Neptune SystemCare Ultimate, whose built-in Big File Manager would help you scan and display the file that takes up most of your hard disk resources, so that you can erase these dump files within a few clicks.

Reason 2 Too many Startup items

With lots of startup programs and services, your Windows 10 PC will take a long time to boot since all these programs need time to start and continue to run in the background after, which may use up RAM or other resources and thus make the Windows 10 run with great efforts.


1. You can pull these out by Task Manager.

Type Task Manager in the search box from the Start menu, click into it and find Startup tab.

Right-click on a program or service from launching at startup and Disable.

2. Use Startup Manager to have a smarter decision

What Startup Manager in Neptune SystemCare Ultimate’s good at is its list including each program's name as well as its publisher, services and function, whether it's enabled to run on startup, and its Boot time, which is how much it slows down Windows 10 when the system starts up.

Reason 3 Running Multiple Programs that Hogging RAM

Most of the users love to leave the opened browsing windows, files and programs alone, in case they want to use it anytime. Nevertheless, this kind of habit is always taking up lots of memory and slows down your once-fast Windows 10 machine.


1. Have an eye on your CPU and get used to shutting down the windows on time

To do this, you should open Task Manager to see how much CPU and RAM these programs take up when they are working and End Task on the unnecessary programs.

2. Take advantage of Floating Tray

One click on the Neptune Floating tray and your Windows 10 would release as many resources as possible with no working programs stopped unless you want them to.

Reason 4 Thousands of Fragments on Hard Disk

If the hard disk is with a lot of fragments, which come from the writing, deleting and recovering, it will do much extra work to access the files, which slows Windows PC.


1. Use Windows Disk Defragmenter

Type Task Manager in the search box from the Start menu, analyze and optimize.

2. Use Smart Disk Defrag

Disk Defrag employs the same techniques as Windows’ Disk Defragmenter, but with much more in the way of customization.

Now the most possible factors that can slow down your Windows 10 PC have been listed, and corresponding solutions are also displayed. Please feel safe to try our solutions out. It brings no damage to both data and system.