Delay in operating system when I click on any application

Am having an issue with my operating system when I try to run any application. When I watch video on my computer it freezes for like 2sec and resumes, when I open an application it stops for like 3secs then it opens, if it's a program say Corel Draw or photoshop or any other, whiles on the program it freezes for like 4 to 7sec when using a tool. Am running on an i7, 8GRam, I have run diagnostic on the hard drive and memory everything is working perfectly. Can anyone here help with this issue

I didn't find the right solution from the Internet.

References:
https://www.cnet.com/forums/discussions/...ny-application/

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