Each time I find myself wondering why is my computer so slow all of a sudden, I refer back to the following checklist of common performance problems and solutions.
Is the PC overheating? Doing a quick check of the air vents to make sure they are not blocked by dust or other impediments. Go to the BIOS menu to check the diagnostics for CPU temperature and fan speeds. If these are not according to general guidelines then open up the PC casing and clear out any dust from filters and fans using a can of compressed air.
Have you checked for viruses? A malware application or other type of computer virus can regularly cause corruption to your operating system files and use a lot of CPU and RAM power if they are constantly running in the background. Run a complete scan of your hard drive and any external storage. Use a registry cleaner or computer repair software to repair the Windows registry, if required.
Is there enough free space on the hard drive? Windows uses virtual memory (i.e. the paging file) on the hard drive to process applications and OS programs. If free space drops below 10% on the hard drive then this virtual memory will start to be constricted and your computer will slow down. Remove old applications to free up some space quickly and then run Disk Cleanup to clear out temp files.
Has the hard disc been defragmented recently? Disk fragmentation leads to slow read/write access times for all programs on the computer. Run the Disk Defragmenter tool every month in order to reorder the data fragments on the disk in such a way as to optimize disk access times.
Are all your programs up-to-date? Check Windows update service to make sure you have the latest security and cumulative fix packs for your operating system and associated programs. If the computer is going slow all of a sudden when using specific applications then check these programs for updates and/or known performance faults.
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